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Old 12-23-2003, 05:57 PM
TL-Iguana's Avatar
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Swapping a Muncie m465 to a TH350

I would like to swap my useless m465 granny low tranny for a brand new TH350, but I would like to know if I need to change the cross member. Has anyone else done this before?? Its going to be done in a 1978 Chevy Custom Deluxe 20 pickup. I have all the parts, and the new tranny, drive shaft etc, and it all measures up right, but it seems that the transmission mounts on the base of the TH350 are too far forward to bolt onto the crossmember. I have also tried with the crossmember from a different truck that was meant to go with the TH350 to begin with, but its still about a 1/4 of an inch out. Is there a different mount that I could buy that would give me the correct placement for the holes? Or do I have to re drill the frame. If this is the case, is this a good idea to be putting more holes in my frame just to make this fit?

The only reason Im doing this is, it was all free so why not!

Thanks,

TL

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Old 12-23-2003, 06:32 PM
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If things don't measure up redrill the frame.
If you are worried about frame strength find the factory crossmember support brackets, or make a set of your own.
If you need the measurements for these brackets, or never heard of them I will be at the shop friday and most of the weekend, and I could take measurements and pics.
Just for reference there at least 4 different crossmembers that will bolt directly into the same bolt holes in your frame.
There is also an alternative to using the brackets, drill the bottom of the frame to accept the crossmember, drill through the top of the same framerail at each bolt location.
Using washers on each surface of the framerail (4 washers per bolt), install a bolt long enough to protrude past the top of the framerail enough to seat the nut fully on the bolt threads.
Between the top and bottom framerail surfaces inside the frame install a short section of black plumbing pipe to snugly fit in the space to add support.
I can also post a picture of this if the description in not clear enough.
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Old 12-26-2003, 11:32 AM
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Thanks!!! Worked great. I didnt even need to re drill. It turns out that the old x-member has slightly warped over the 31 years of service. With a little massaging and whatnot, the tranny bolted straight up, like it was meant to be . Now for the longer drive shaft, and Im back up and running!! WHoohoo


Best x-mas ever thanks to you guys

TL
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