Rear Gear Question - Page 3

impstocker · 09-25-2013, 10:33 AM

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

Dan Fahey · 09-25-2013, 10:52 AM

Quote:

Originally Posted by impstocker

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

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

5389stk · 09-25-2013, 10:38 PM

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

njk53 · 09-26-2013, 01:40 PM

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.

Bob Bender · 09-26-2013, 05:55 PM

Just put the 5.86 in like mine. Lmao

Lew Silverman · 09-26-2013, 06:05 PM

X2 on the 5.86! Things happen much faster!

Wade_Owens · 09-30-2013, 11:49 AM

Quote:

Originally Posted by Bob Bender

Just put the 5.86 in like mine. Lmao

Bobby, I figured you for a 6.50 rear gear!

-

Wade

superstockdave · 10-01-2013, 09:03 PM

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

njk53 · 10-02-2013, 09:02 AM

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..

Jim Kaekel · 10-02-2013, 09:12 AM

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.

09-25-2013, 10:33 AM	#21
impstocker Member Join Date: Dec 2008 Location: Wingdale, NY Posts: 302 Likes: 27 Liked 53 Times in 16 Posts	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

09-25-2013, 10:38 PM	#23
5389stk Junior Member Join Date: Aug 2013 Posts: 29 Likes: 0 Liked 72 Times in 6 Posts	Re: Rear Gear Question njk 4.88 or 5.13 converter is close; try stock gears in trans.More power always helps. test,test

09-26-2013, 01:40 PM	#24
njk53 Senior Member Join Date: Jul 2007 Location: East China, MI Posts: 504 Likes: 0 Liked 0 Times in 0 Posts	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. __________________ Nelson Kowal Stock 345

09-26-2013, 05:55 PM	#25
Bob Bender VIP Member Join Date: Jan 2009 Location: Maryland Posts: 1,733 Likes: 1,599 Liked 459 Times in 90 Posts	Re: Rear Gear Question Just put the 5.86 in like mine. Lmao __________________ Bob Bender 144 O/SA 2010-2012 National Record Holder

09-26-2013, 06:05 PM	#26
Lew Silverman VIP Member Join Date: Mar 2010 Location: Newport News, VA Posts: 1,435 Likes: 371 Liked 129 Times in 59 Posts	Re: Rear Gear Question X2 on the 5.86! Things happen much faster! __________________ Lew Silverman #2070 "The Wagon Master" N/SA

10-01-2013, 09:03 PM	#28
superstockdave Junior Member Join Date: Jun 2013 Location: Morningview Ky Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	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

10-02-2013, 09:02 AM	#29
njk53 Senior Member Join Date: Jul 2007 Location: East China, MI Posts: 504 Likes: 0 Liked 0 Times in 0 Posts	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.. __________________ Nelson Kowal Stock 345 Last edited by njk53; 10-02-2013 at 09:08 AM.

10-02-2013, 09:12 AM	#30
Jim Kaekel VIP Member Join Date: Jul 2002 Location: Michigan Posts: 1,227 Likes: 133 Liked 531 Times in 108 Posts	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. __________________ Jim Kaekel 3836 STK