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Pontiac Forum: Pontiac GTO 1967 400CID 4sp manual OVERDRIVE
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  #1  
Old July 25th, 2018, 05:56 PM
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Pontiac GTO 1967 400CID 4sp manual OVERDRIVE

Because of very short rear end (about 4.11 according to the calculation)
I was considering to change the gearbox, which is Muncie M 20 with another gearbox from Tremec.
I would love the 6 speed Tremec with similar gear ratios in 1st 4 gears and have 2 more over.
But the necessity of body cutting made a clear stop to this project.
Now I am considering to buy an overdrive from GearVendors, where there is probably some minor change to the body.
Do you have some experience with the overdrive from GearVendors?
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Old July 26th, 2018, 09:51 AM
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Have you spoken to this company?
https://shiftsst.com/articles/cat/ge...967-gm-a-body/
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Old July 27th, 2018, 10:38 AM
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Yes, i did.
They made me a quote and sent the instalation manual. But unfortunately, there is a lot of tunnel cutting.
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Old July 27th, 2018, 10:43 AM
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Lucky from HotRodGarage just put one in the Fury wagon from the show, check it out on YouTube .

Doug in P.R.
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Old August 20th, 2018, 06:14 AM
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Thank you for the video. It seems that the amount of changes is very similar to what somebody has to do in case of changing to Tremec gearbox.
So I finally decide to buy Tremec Magnum 6 speed with this gear ratios:
2.66, 1.78, 1.30, 1.00, 0.80, 0.63

Thank you for your help :-)
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Old August 20th, 2018, 10:19 AM
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good luck with your project
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