OVERDRIVE
- OldGPW
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- Jon S
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Re: OVERDRIVE
Marty, thanks for posting this!! I am a purist, but I am in the midst of planning a very long trip in the MB... I now think that an overdrive may be the way to go. I like the clean way that you installed it and also the fact that you can reverse the process and have a stock jeep again if you want... I am also thinking about using my Kaiser Supersonic head on the engine to help out a little... Do you think it would boost the performance a little?
Thanks for all your technical work on this!! I want to copy the way you installed the unit!!! Very SANO!! Jon S.
Thanks for all your technical work on this!! I want to copy the way you installed the unit!!! Very SANO!! Jon S.
Jon S.
MB213689 2-22-43 20307087
MB198901 12-29-42 20250940
REO US6 4-17-45 R218261
GPW 1533 2-27-42
MB213689 2-22-43 20307087
MB198901 12-29-42 20250940
REO US6 4-17-45 R218261
GPW 1533 2-27-42
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Re: OVERDRIVE
Thanks for the compliments!
Jon S., The higher compression Supersonic head should help! Be sure to use the later, gear drive head gasket as the combustion chamber shape is different than a chain drive head. Fel Pro sells both styles, the # 7285B is the correct one for the gear drive head and costs about $15 at O'Reillys. http://www.oreillyauto.com/site/c/searc ... vi=1440562" onclick="window.open(this.href);return false;
If you decide to copy the shifter setup I used, the longer shifter pin can be easily made without a lathe, all it really needs is a groove or notch for the set screw to hold it in place, a file will cut one easily. The local hardware store will have 1/2" diameter cold rolled steel round rod to make it with. It doesn't really need to be drilled for a grease fitting, you could simply oil the pin occasionally from below with a spray lube. I'll see if I can take a picture or scan of my shifter boot retaining ring set on a piece of 1/4" graph paper to make a copy of one a bit easier.
OldGPW, About two months ago I installed an overdrive in my friend's 44 MB, in the same way as the post. We got it from Herm the Overdrive guy, too. When I put it in, I used a double rubber sealed rear output bearing on the T-84, and sealed the gaps in the splines and around the bearing itself with RTV sealer. He hasn't taken it on any long trips at high speed yet, but driving it around town and in the desert, it didn't leak. With the stock, non-sealed bearing, it would transfer oil from the t-case into the trans and leak while driving it around town. The local O'Reilly's had the # 307FF bearing in stock!
http://www.oreillyauto.com/site/c/detai ... word=307ff" onclick="window.open(this.href);return false;
I've not gotten around to changing it on mine, yet!
Jon S., The higher compression Supersonic head should help! Be sure to use the later, gear drive head gasket as the combustion chamber shape is different than a chain drive head. Fel Pro sells both styles, the # 7285B is the correct one for the gear drive head and costs about $15 at O'Reillys. http://www.oreillyauto.com/site/c/searc ... vi=1440562" onclick="window.open(this.href);return false;
If you decide to copy the shifter setup I used, the longer shifter pin can be easily made without a lathe, all it really needs is a groove or notch for the set screw to hold it in place, a file will cut one easily. The local hardware store will have 1/2" diameter cold rolled steel round rod to make it with. It doesn't really need to be drilled for a grease fitting, you could simply oil the pin occasionally from below with a spray lube. I'll see if I can take a picture or scan of my shifter boot retaining ring set on a piece of 1/4" graph paper to make a copy of one a bit easier.
OldGPW, About two months ago I installed an overdrive in my friend's 44 MB, in the same way as the post. We got it from Herm the Overdrive guy, too. When I put it in, I used a double rubber sealed rear output bearing on the T-84, and sealed the gaps in the splines and around the bearing itself with RTV sealer. He hasn't taken it on any long trips at high speed yet, but driving it around town and in the desert, it didn't leak. With the stock, non-sealed bearing, it would transfer oil from the t-case into the trans and leak while driving it around town. The local O'Reilly's had the # 307FF bearing in stock!
http://www.oreillyauto.com/site/c/detai ... word=307ff" onclick="window.open(this.href);return false;
I've not gotten around to changing it on mine, yet!
43 Ford GPW 92098
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license
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Re: OVERDRIVE
I have a super sonic head in my cjv-35.Great addition.Also stronger with the addtional ribs between the spark plug holes.Very nice looking set up Marty.What is your final gear ratio in third overdrive?Artificer has a point about the windshield.In my estimation,that's probably why willys went to the rectangular windshield on the cj-3a.3b,m-38 jeeps.Stronger than the tube type of mb,gpw,cj-2a.
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Re: OVERDRIVE
cjv-35 The .75 ratio is equal to having 3.73 gears while in overdrive, compared to stock 4.88s. On a CJ or M38 with 5.38s, it would make it the approximate equal of 4.10s.
Here's a link to one online ratio/speed calculator: http://www.public.asu.edu/~grover/willys/speed.html" onclick="window.open(this.href);return false;
Here's a pic of me at speed on the 10 Freeway near the Morongo Casino!
Here's a link to my Photobucket trip album:
http://s551.photobucket.com/albums/ii47 ... th%202010/" onclick="window.open(this.href);return false;
Here's a link to one online ratio/speed calculator: http://www.public.asu.edu/~grover/willys/speed.html" onclick="window.open(this.href);return false;
Here's a pic of me at speed on the 10 Freeway near the Morongo Casino!
Here's a link to my Photobucket trip album:
http://s551.photobucket.com/albums/ii47 ... th%202010/" onclick="window.open(this.href);return false;
43 Ford GPW 92098
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license
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Re: OVERDRIVE
That sounds like GREAT freeway gears to me.The L-4 should not be over revving with that ratio.Great looking picture of the beast on the freeway.I installed a warn overdrive in my cjv-35 way back in 1978 when I purchase my jeep.Best thing I ever did.I took it up to 70 mph for no more than 1/2 mile.WOW,enough of that.Best speed for me is 50mph.Take care.
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Re: OVERDRIVE
Finally got your pictures from your trip to come up on my dial-up.Your jeep looks the BEST of all of them.
- Cacti_Ken
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Re: OVERDRIVE
great photos. I guess I'll have to move to another location if I want to have fun with my jeep.
I put a overdrive unit in my M38. I went for a drive last month for 88 miles and used 3.5 gallons of gas. I thought that was pretty good.
I put a overdrive unit in my M38. I went for a drive last month for 88 miles and used 3.5 gallons of gas. I thought that was pretty good.
Tropical Vet 67-68,
2nd Bn, 35th Inf. Reg., 4th I.D. VN
1951 M38 DOD 10/51
1951 M100 DOD 9/51
2nd Bn, 35th Inf. Reg., 4th I.D. VN
1951 M38 DOD 10/51
1951 M100 DOD 9/51
- OldGPW
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Re: OVERDRIVE
Marty, just saw the reply (somehow I missed it!). That is VERY good to know, I'm probably going to pick one of these up and this thread has been a great help in getting me interested in actually doing it!Marty, SoCal wrote: OldGPW, About two months ago I installed an overdrive in my friend's 44 MB, in the same way as the post. We got it from Herm the Overdrive guy, too. When I put it in, I used a double rubber sealed rear output bearing on the T-84, and sealed the gaps in the splines and around the bearing itself with RTV sealer. He hasn't taken it on any long trips at high speed yet, but driving it around town and in the desert, it didn't leak. With the stock, non-sealed bearing, it would transfer oil from the t-case into the trans and leak while driving it around town. The local O'Reilly's had the # 307FF bearing in stock!
http://www.oreillyauto.com/site/c/detai ... word=307ff" onclick="window.open(this.href);return false;
I've not gotten around to changing it on mine, yet!
Thanks for the update.
Old GPW.
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Re: OVERDRIVE
I finally got around to changing to the sealed bearing, and this time I took some pics! I posted it in the regular MB/GPW Technical forum, here's a link:
http://www.g503.com/forums/viewtopic.php?f=4&t=183156" onclick="window.open(this.href);return false;
http://www.g503.com/forums/viewtopic.php?f=4&t=183156" onclick="window.open(this.href);return false;
43 Ford GPW 92098
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license
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Re: OVERDRIVE
Add a 3rd jeep with Overdrive....just doing mine now plus modifying the breather.Marty said: On both jeeps, the oil transferring got worse after installing Warn Overdrives, probably from being driven at higher speeds.
Toyota have same oil transfer issues & apparently the t/f case fill plug & tranny fill plug are interconnected by tubing to alleviate the problem, I saw somewhere on a forum.
Also found out the new flange/s (from reputable sources) fitted to rear transfer case is shorter than the originals so a shim of about 1/16" needs to be fitted between flange & bearing otherwise the washer & nut bottom out on the splines instead of pulling up tight. Easily missed on assembling & torquing in situ.
John GIBBINS Member Institute of Automotive Mechanical Engineers [Ret], ASE Master Medium/Heavy Truck & Auto Technician USA -2002 Licensed Motor Mech NSW MVIC 49593 Current 2015
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.
- Cacti_Ken
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Re: OVERDRIVE
[/quote] Also found out the new flange/s (from reputable sources) fitted to rear transfer case is shorter than the originals so a shim of about 1/16" needs to be fitted between flange & bearing otherwise the washer & nut bottom out on the splines instead of pulling up tight. Easily missed on assembling & torquing in situ.[/quote]
I got short yoke a few months ago. I don't know what the manufacturer's problem is. Obviously cutting to the wrong specs. The vendors need to send them all back and make them get it right. Where ya gonna come up with the correct shim washer when your trying to finish the job when your not aware that you got a mismanufactured part shaft all of a sudden.
I sent the yoke back for the correct one. And they found one and sent it to me.
I got short yoke a few months ago. I don't know what the manufacturer's problem is. Obviously cutting to the wrong specs. The vendors need to send them all back and make them get it right. Where ya gonna come up with the correct shim washer when your trying to finish the job when your not aware that you got a mismanufactured part shaft all of a sudden.
I sent the yoke back for the correct one. And they found one and sent it to me.
Tropical Vet 67-68,
2nd Bn, 35th Inf. Reg., 4th I.D. VN
1951 M38 DOD 10/51
1951 M100 DOD 9/51
2nd Bn, 35th Inf. Reg., 4th I.D. VN
1951 M38 DOD 10/51
1951 M100 DOD 9/51
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Re: OVERDRIVE
WOW, is there anything that can't be done to the AAW! Great Job!
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Re: OVERDRIVE
Here is how one can mount up a rear overdrive lever by mounting an old transfer case lever where you can just drop your left hand straight on for changing range.
Just drill appropriate hole in the lever flat that normally fits the shifter slot & away you go....correct length threaded rod with locknuts & a couple of heim/rose joints. Very EZ & doesn't look out of place. In case one asks this has been in use for over 12 mo. & that is the fuel line run across the top (1.5" or 35mm clearance), which is going to be moved one day.
Just drill appropriate hole in the lever flat that normally fits the shifter slot & away you go....correct length threaded rod with locknuts & a couple of heim/rose joints. Very EZ & doesn't look out of place. In case one asks this has been in use for over 12 mo. & that is the fuel line run across the top (1.5" or 35mm clearance), which is going to be moved one day.
John GIBBINS Member Institute of Automotive Mechanical Engineers [Ret], ASE Master Medium/Heavy Truck & Auto Technician USA -2002 Licensed Motor Mech NSW MVIC 49593 Current 2015
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.
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Re: OVERDRIVE
Looks like the best way to connect the rear shifted Warn overdrive unit! Looks like you used a stock T84 leather shifter boot and floor ring, too.
43 Ford GPW 92098
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license
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