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| Re: [GMCnet] Power Drive [message #86647 is a reply to message #86635] |
Sun, 30 May 2010 18:19   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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Senior Member |
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Rob,
When I had to rebuild an engine for the GMC immediately after buying it in
'98, I had a r300 "bench overhaul" done on the transmission and installed
the Caspro Power Drive. That transmission and chain drive are now in the
X-PB my son has. I put about 63,000 miles on it before replacing it with
the new front clip; he's probably put another 5,000 mile on it. The rebuilt
torque converter failed after 10,000 miles (cracked around the hub, just
like JR Slaten's recent failure), but otherwise, there's never been any
problem whatsoever with the transmission or chain drive.
That was before JimK started selling high ratio final drives. If I had to
choose between the 3.50 chain and his 3.55 today, it would be a hard choice,
but if I had the transmission out anyway, I'd probably save the $$$ and go
with the chain.
At the time I installed my chain, they were still being distributed by Chuck
Stoddard's Caspro; Manny has now bought the rights and is selling them.
By the way, have you thoroughly investigated the 3.21 installation? A
Dixielander buddy recently bought one that we plan to install soon.
Discussing it with 3.21 experts was an eye-opener: It's not necessarily a
straight-forward, no potential problems, affair. Axle bearings & seals,
input bearing condition, etc., etc, all need attention. I'm sending you
some more info off-net.
Ken H.
Americus, GA
'76 X-Birchaven
www.gmcwipersetc.com
On Sun, May 30, 2010 at 5:33 PM, Rob Mueller <robmueller@iinet.net.au>wrote:
> G'day,
>
> I have a 3.21 FD to install in Double Trouble and am considering installing
> one of these:
>
> http://www.casprogmc.net/powerDrive.html
>
> I vaguely remember reading that there is a down side to these unit over the
> lower ratio final drive units sold by Jim K but CRS has erased that
> recollection. I went through my transmission and final drive folders but
> found NADA.
>
> What's the advantages / disadvantages of Power Drive vs. lower final drive
> ratios?
>
> Also I vaguely remember that Manny took over from Caspro, did I get that
> right?
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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