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Wedge TR7 High Speed Rear End

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Delmon

Freshman Member
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I need a high speed third member for my 1980 TR7. I am running a 3:96, I need a 3:08, I think that is the highest ratio made. I am tired of running 3000 rpm at 60 mph.
 
1980's came stock with a 3.45. The coupes had the 3.90s, but I've seen many a car with the rear end swapped out. The 3.08s only came in the 2800 or so TR8s, and the 81 TR7 automatics. Good luck trying to find one. Another longshot would be to find a rear end out of a Rover SD1. You could swap the ring and pinion into your pumpkin. The only problem with that is the parts to rebuild the rear end are even harder to find than a spare 3.08. That is why so many TR8s are running the 3.45, and why so many people are building Ford 8.8 posi disc brake rear ends to stick under the TR8s. The 3.45 will yield about 70 MPH at 3000 RPM in fifth gear.
 
i picked up a ring and pinion gear from the uk pretty reasonably. i think a 2.86 ratio. crush spacer was the hardest to find.
 
MY 8 came with 3.90 because the DPO thought he was going to be a race car driver then he got married and his wife told him he was going to be an accountant. I drove the 3.90 for a few years but went to the 3.45, it was like adding a 6 gear. It made it so much more drivable
 
I cant use a TR7 trans, im running a Buick 3.1 V6, with a 350 tranny. I might change to a overdrive tranny and help some. I would have to cut the driveshaft again and balance it.
 
I cant use a TR7 trans. I have a Buick 3.1 V6 in car, using a 350 trans. I might switch to a overdrive trans, would have to cut driveshaft though.
 
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