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post #1 of 6 (permalink) Old 01-08-2011, 11:29 AM Thread Starter
 
 
Join Date: Jan 2011
Location: florida
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Hey new member here guys. I have a 1967 fastback 283 powerglide. I am looking to make it a 4 speed muncie m20 car soon.

I need help with the process though after reading the old threads I decided to register to ask questions.

If I have a bench seat and want to keep a bench seat do I need the hump for the shifter to clear?

dave
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post #2 of 6 (permalink) Old 01-08-2011, 08:02 PM
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Welcome to thee site! My guess is you need the hump.
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post #3 of 6 (permalink) Old 01-09-2011, 12:19 AM
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Welcome to the Team Dave!

You don't need the hump but it will look a lot better with it installed. Without the hump you need a huge rubber boot to cover the larger than average hole you cut in the floor to clear the shifter mecahnism.

Big Dave
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post #4 of 6 (permalink) Old 01-09-2011, 09:28 PM Thread Starter
 
 
Join Date: Jan 2011
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Thanks for the Info Dave! Does the muncie require a different length drive shaft than the automatics or is the muncie the same length as the th350/400 or powerglide?

Dave
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post #5 of 6 (permalink) Old 01-10-2011, 06:41 PM
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The Muncie four speed is the same length and uses the same 27 spline output shaft as the TH350, the PowerGlide and the three speed Saginaw manual transmission (as well as the newer 200R4 overdrive transmission).

All four of these are a direct bolt in as to the size of the tranny dimensionally. The TH400 is a bigger (taller, longer, heavier) transmission and it uses a larger 32 spline output shaft requiring a new front yoke on the drive shaft to fit it.

The 700R is three inches longer than the TH350 it is based upon (they did add a an extra gear in the tranny after all), but it uses the same smaller 27 spline out put shaft as the TH350, but it uses the TH400 rear transmission mount position that is already stamped into all B-body car's frame made from 1965 up to 1999 (you just shove the TH350 transmission cross-member back to line up with the new holes after grinding or sawing off the front lip to clear the TH400's tranny oil pan if actually using a TH400 transmission). If you have a 1958-'64 "X" frame car then I would recommend the 200R4 over the 700R4 as there are fewer size issues to make it fit.

Big Dave
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post #6 of 6 (permalink) Old 01-11-2011, 07:55 AM
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In some GM cars the plate the shifter mounts onto the tranny is different for a bucket seat car and a bench seat car.
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