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TH425 Lower First Gear Ratio [message #124579]

Wed, 04 May 2011 12:59

bwevers

Messages: 597
Registered: October 2010
Location: San Jose

Karma: 5

Senior Member

Hello All,
I was reading about the similarities between the TH400 and the TH425 and saw that there is a lower ratio gear set available. I wondered if anyone had ever tried using the 2.75 or 2.97 instead of the standard 2.48. This would have the same effect as installing a 3.50 final drive (in first gear) but would have the same highway gearing. Manny has probably tried this already.

Regards,
Bill Wevers

Bill Wevers GMC49ers, GMC Western States 1975 Glenbrook - Manny Powerdrive, OneTon 455 F Block, G heads San Jose

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Re: [GMCnet] TH425 Lower First Gear Ratio [message #124600 is a reply to message #124579]

Wed, 04 May 2011 15:53

mannystrans

Messages: 209
Registered: June 2006

Karma: 1

Senior Member

Yes I did and it got me stranded. They are good for racing
applications but not for the GMC motorhome.
--
Manny Trovao
mannystrans@gmail.com
Manny's Trans / Power Drive
San Jose, California
408-937-1583
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Re: [GMCnet] TH425 Lower First Gear Ratio [message #124605 is a reply to message #124600]

Wed, 04 May 2011 17:19

bwevers

Messages: 597
Registered: October 2010
Location: San Jose

Karma: 5

Senior Member

Thanks Manny,
I will stay away from those gears Laughing

Bill Wevers

Bill Wevers GMC49ers, GMC Western States 1975 Glenbrook - Manny Powerdrive, OneTon 455 F Block, G heads San Jose

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