Re: Rear Gear Question
 

This is a great thread for me as it answers basically my same question. I am building a 1965 Impala with the 396/325 BBC combo for I/SA at 4100 lbs. I will be using the same motor from my 68 Impala I ran but that was a Stickshift car (Jerico) I will be running a Turbo 350 w the 2.75 first. I will be using the rear from the 68 which has 4:88's in it. I do have a set of 4:56 which I thought might be better with the Turbo 350, but i think I will stick with the 4:88's at first. I have heard the same thing going as high as 4:30's, but i feel with the weight of the car the 88's will be better.

I think my best 60' time was a 1.60 with the 68' , but I feel I never got the clutch set-up right (Mcleod Rev-Lok) I did MPH pretty good (114-117 MPH ) that was at 6600 RPM through the traps, so I am hoping with the automatic I can see the full potential of this combination, seeing that the index is 2 tenths quicker than when i last ran! (I ran 11.70's with the 68)

Any input this way would also be appreciated.
Will Lamprecht
Div 1, 65 imp big ole chevy

l

Re: Rear Gear Question
 

Yeah this is a great thread.
My 1969 Impala still under re-construction has 5.13's.
Have a Budd Rowe built 350/255 in storage with an early cam.
The Dyno shows it is all done by 6000rpm.

Building it to run Stock. For now will run Pure Stock until a modern cam is installed.
Still have the 3800 TCI Converter and TurboAction 350. This will definitely need some upgrade.

Will's 396/325 would be a 427/335 for my car and may consider the larger engine.
Both have the same cam and the shift points should be lower.
Think it is a better combination than the 427/390.

Would need the T350 with a 2.75 gear for either car.
Get the feeling the 5.13's need to be 5.38's for the 350.
But the 5.13's maybe be too much for a 427.

Dan

Re: Rear Gear Question
 

njk 4.88 or 5.13 converter is close; try stock gears in trans.More power always helps. test,test

Re: Rear Gear Question
 

I agree with the testing but Milan Dragway is an hour and fifteen minutes away. Wish the old Detroit Dragway was still there that was a 1/2 hour drive.

Re: Rear Gear Question
 

Just put the 5.86 in like mine. Lmao

Re: Rear Gear Question
 

Re: Rear Gear Question
 

Bobby, I figured you for a 6.50 rear gear! ;)-

Wade

Re: Rear Gear Question
 

Nelson, I started reading this and realized this my old car. I would like to save you some money, don't try 513 gear, it lost ET. I assume that you are still running the motors that I had built from Parson/Meyers, I would start with valve springs and more valve spring pressure. Valves spring pressure is the key to horsepower for stockers and as you know I spent a lot of money on that car learning. Hope this helps

Re: Rear Gear Question
 

Dave, I am not going to go to a 5:13 gear. We still have the 4:56 gear that you had in it. However, my brother talked to Bruce and he said the car should be going through the lights at 6400 rpm and it isn't. We were thinking on going to a 4:88 to get the car off center faster and increase the trap rpm as Bruce suggested..

Re: Rear Gear Question
 

Nelson: Just my opinion and you've been given plenty, but converter seems too tight, maybe 200-300 looser. I'm not sure what circumference tires you have, but they can be used to "tweak" the RPM's a bit, particularly when you're using a 2.75 trans. Don't forget that the wider gearing of the trans. makes the RPM's fall down more on the gear change. If you're running a 94" tire, a 92" tire will help get the RPM's up. A looser converter will help as well on the gear change.