Page 6 of 6

Re: M20 / M8 Parts Crossover Chart

Posted: Tue May 19, 2020 9:10 am
by 82ndrecontbp
Did anyone ever find a shock that works?

Every day that goes by on the orginals makes me a little more nervous.
In the midst of a total resto so now is the ideal time to replace.

Re: M20 / M8 Parts Crossover Chart

Posted: Tue May 19, 2020 5:19 pm
by dgrev
I did. An equivalent that is within a few millimetres of the extended length of an original. I can get them here in Oz.

Re: M20 / M8 Parts Crossover Chart

Posted: Fri May 22, 2020 12:53 pm
by 82ndrecontbp
LOL - Care to share? Or is it unique to the land of Oz?

Re: M20 / M8 Parts Crossover Chart

Posted: Fri May 22, 2020 4:59 pm
by dgrev
No idea of the brand now, I repainted them to go on my Greyhound.

Can back track and see if they are still available. It was probably 8 years ago and IIRC cost was around
AU$1,600 for the 6. Need to identify the company I sourced them through.

Re: M20 / M8 Parts Crossover Chart

Posted: Sat May 30, 2020 9:49 pm
by Big D
Hi 82nd recontbp,

Some French dealers have the shocks listed. Did you try them?

Re: M20 / M8 Parts Crossover Chart

Posted: Sat May 30, 2020 9:49 pm
by Big D
Hi all,

I’m looking to locate the wheel cylinder kits in the cross over list. I’m hoping they may solve my leaking wheel cylinder issues. The types are:

• Raybestos WK37
• Napa UP37
• Carquest EIS C550

All of the online resellers I’ve found appear to be out of stock. EBay has nothing listed. I know these kits were used in some models of Chevy truck. Has anyone got a lead on where I might find these kits?

Thanks

Re: M20 / M8 Parts Crossover Chart

Posted: Sun May 31, 2020 11:32 am
by 82ndrecontbp
Here are two sources I found:

https://www.thewrenchmonkey.ca/products ... stos/wk37/
seems to be in Stock but is in America Junior.

https://www.finditparts.com/products/38 ... stos-wk-37#

Not sure why there is suddenly a shortage, but there is indeed.
Do you need all 6?
I have a few extra and we're a ways away from getting to the brakes. I can send you some and wait for more.

Re: M20 / M8 Parts Crossover Chart

Posted: Sun May 31, 2020 12:01 pm
by John Neuenburg
Try the dealers selling GMC CCKW parts. I think it's the rear wheels cylinder kit. Or go over to the truck forum and ask who has spares.

Re: M20 / M8 Parts Crossover Chart

Posted: Sun May 31, 2020 5:20 pm
by Big D
Hi John and 82ndrecon,

Thanks for the replies. I'm inclined to get say four kits, so that I can then do 2 wheels and be sure it has solved the problem without spending a pile of money for no improvement. Everything I read here suggests that in the US, everyone who has done it has had good results. I'm not sure what the difference is with the guys in Europe though. Everyone I speak to over there say they just use the standard NOS donut cups (with cylinders that aren't sleeved) with no issues.

I'll try those sources you've suggested.

Re: M20 / M8 Parts Crossover Chart

Posted: Sun May 31, 2020 5:32 pm
by John Neuenburg
Big D wrote:
Sun May 31, 2020 5:20 pm
Hi John and 82ndrecon,

Thanks for the replies. I'm inclined to get say four kits, so that I can then do 2 wheels and be sure it has solved the problem without spending a pile of money for no improvement. Everything I read here suggests that in the US, everyone who has done it has had good results. I'm not sure what the difference is with the guys in Europe though. Everyone I speak to over there say they just use the standard NOS donut cups (with cylinders that aren't sleeved) with no issues.

I'll try those sources you've suggested.
I went with the shorter pistons and cup seals during my complete brake job and liked the results. There has been a lot of brake talk on the G over many years, some of it by me. Does anyone make repro donut seals?

Re: M20 / M8 Parts Crossover Chart

Posted: Sun May 31, 2020 5:53 pm
by Big D
Hi John

Yes, I read over all the posts you had made about your brakes. It does sound very good.

The reproduction donut cups that I got made cost the equivalent about $10 USD each so $20 per cylinder. I’m glad I didn’t get enough for all the wheels, knowing now that they weren’t a fix.

Re: M20 / M8 Parts Crossover Chart

Posted: Mon Jun 01, 2020 12:51 pm
by John Neuenburg
If repro stock ones work then that is OK but if the lip is as sharp as original I think there is less rubber on the cylinder and a smaller pit would cause a leak. Just a guess. The cup seals have more rubber in them and were more flexible than my original seals and I can't imagine repro donuts would match the flexibility.

My other theory, for those who haven't read past threads, is a theoretical negative to cups. Unlike most brakes, these cylinders are vertical and it might be possible for an air bubble to stay trapped in the lower cups. I don't know if bleeding will move that out. If the cylinders were horizontal like most cylinders a bubble would float away. My brakes always had a spongy feel, although with the 3rd model hydrovac it had a big power brake effect. Maybe it was slightly different adjustment from wheel to wheel? Or just the way these vacs work?