LS1 into a 73 cheyenne - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**nlped** · 09-13-2010, 07:42 AM

WOW...SEXY!!!

Question though. Won't a 3.70 gear with that 31" tall tire and the 4L60e trans have a very low highway speed RPM? Just doing the math it seems like it would be better with a 3.90 or possibly a 4.10 final drive. That's the luxury of a Ford 9", lots of gear choices.

Anyhow, Man... It is looking awesome!!!

RandyP · 09-13-2010, 08:22 AM

That is one sexy looking view from the back. Always have liked those views the best on the ladies though.

smokedat · 09-13-2010, 05:39 PM

I agree I previously had 4.10 and i really like how it cruised on the highways might just stick to 4.10's

Quote:

Originally Posted by nlped

WOW...SEXY!!!

Question though. Won't a 3.70 gear with that 31" tall tire and the 4L60e trans have a very low highway speed RPM? Just doing the math it seems like it would be better with a 3.90 or possibly a 4.10 final drive. That's the luxury of a Ford 9", lots of gear choices.

Anyhow, Man... It is looking awesome!!!

68 TT · 09-13-2010, 06:01 PM

Quote:

Originally Posted by smokedat

I agree I previously had 4.10 and i really like how it cruised on the highways might just stick to 4.10's

You have quite a bit of rubber out back and at 31" tall you might want to look into going with a 4.57 gear instead. 60 mph is only 2080 rpm so it is still going to be pretty low rpm on the freeway. If you drive in the car pool lane in LA you will only be running 3120 rpm at 90 mph. You will be aerodynamically limited before you run out of gear.

Look for the 4.57 gears vs. the 4.56's as the 4.57 has fewer teeth on both the ring gear and pinion so they are a little tougher.

09-13-2010, 07:42 AM	#1
nlped Senior Member Join Date: Jul 2009 Location: Hayden, Al. Posts: 4,147	Re: LS1 into a 73 cheyenne WOW...SEXY!!! Question though. Won't a 3.70 gear with that 31" tall tire and the 4L60e trans have a very low highway speed RPM? Just doing the math it seems like it would be better with a 3.90 or possibly a 4.10 final drive. That's the luxury of a Ford 9", lots of gear choices. Anyhow, Man... It is looking awesome!!! __________________ Carter 1968 Chevy SWB Fleet... Walt 1963-1/2 Ford Falcon Futura...Martha

09-13-2010, 08:22 AM	#2
RandyP Getting Old; Going Broke Join Date: Apr 2010 Location: Owasso OK Posts: 2,764	Re: LS1 into a 73 cheyenne That is one sexy looking view from the back. Always have liked those views the best on the ladies though. __________________ *Why is every used 350 sbc out of a corvette?* There's only two things that excite a man, expensive toys and real expensive toys. *VEGETARIAN: That's an old Indian word meaning "I don't hunt so good."* When the going gets tough, switch to power tools.



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