CRG Discussion Forum
Camaro Research Group Discussion => Mild Modifications => Topic started by: sdkar on October 03, 2008, 04:22:24 PM
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Hey guys,
There is a 71 Pontiac Grandville at the junkyard near me and it has a TH400. Will this fit in place of a TH350? What modifications will be needed? I anyone interested in buying this transmission if I get it and I am unable to use it?
Thanks,
Steve
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Physically it should fit (the THM400 was used on big-block Camaros), but I'm not sure the Pontiac trans is the same length as the one used in the Camaro, and the Pontiac trans MAY have a different case bolt pattern than the Chevy trans where it attaches to the engine block. Someone more familiar with Pontiacs than I am will have to answer that.
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*That tranny is longer. The tailshaft housing would have to be changed and that means changing the mainshaft. Our Camaros require a shortshaft 400.
*Some Pontiac trannys have multiple application mounting holes. Others will not fit your Chevy block. Exactly which P. trannys will bolt up to the Chevy block I am unsure but the length alone will not be applicable for your requirements.
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Pontiac TH400 has a BOP (Buick, Olds, Pontiac) bellhousing bolt pattern. It doesn't match a Chevy.
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Thanks for the info. The Junkyard wants $75 for it and I thought if I couldn't use it that I could pass it along for what I paid. However, I think shipping could be prohibitive. It does have the longer tailshaft, which means it also has the longer shaft as well, so it would involve more than a simple tail swap. Good price for a TH400, but obviously the right one.
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I also think that the mounting holes are in diffrent spots.