Rear gear question - Page 4

1320racer · Yesterday, 03:32 PM

As I stated in post #5

Quote:

Originally Posted by 1320racer

For optimum ET, If it was mine, it would have a converter that flashes to 5800, I?d be shifting at 7200 and gear it so it?s crossing the stripe at 7700. I would also get a 30? tire under it if you can not go wider.

L.Fite · Yesterday, 05:13 PM

So...
Stupid me is going to throw this out there...

Peak torque is at 5300...
It makes plenty good torque for a 3.75" stroke...
If it falls to 6200 at the gear change I'm going to say you're leaving some power on the table...
I would think if you send dyno sheets to someone like Coan, they could dial you in...
May find you can tighten it a bit?

I think maybe play with the shift point...
As in higher... 7200? maybe more...
See where it slows down...

More gear would help, as would a 3 speed...
If it crosses 72+ it really doesn't matter if the motor doesn't self disassemble...
(don't know the parts or build)
I see things I might try if it were mine...

Depends on your budget really, converters/transmissions aren't cheap these days...

Any way just a few thoughts from a dumb ol' Texas boy...
Maybe some of this helps...
Maybe it don't...
As they say... "Your mileage may vary"

Bob F · Yesterday, 06:14 PM

Its a 440” LS with 4.125 stroke

L.Fite · Yesterday, 06:55 PM

Quote:

Originally Posted by Bob F

Its a 440? LS with 4.125 stroke

Sorry... Thinking Chrysler...

So...Yeah, Think I'd experiment with shift point, doesn't cost anything, just time...
Still think more gear...
Converter...
There's stuff to try before springing for a trans...
Haven't tinkered with LS stuff...

1320racer · Yesterday, 07:09 PM

There?s no question, more gear, higher shift, maybe a converter but not before real data via a data logged but not a 3 speed trans.

Yesterday, 05:13 PM	#32
L.Fite Member Join Date: May 2020 Posts: 435 Likes: 431 Liked 394 Times in 199 Posts	Re: Rear gear question So... Stupid me is going to throw this out there... Peak torque is at 5300... It makes plenty good torque for a 3.75" stroke... If it falls to 6200 at the gear change I'm going to say you're leaving some power on the table... I would think if you send dyno sheets to someone like Coan, they could dial you in... May find you can tighten it a bit? I think maybe play with the shift point... As in higher... 7200? maybe more... See where it slows down... More gear would help, as would a 3 speed... If it crosses 72+ it really doesn't matter if the motor doesn't self disassemble... (don't know the parts or build) I see things I might try if it were mine... Depends on your budget really, converters/transmissions aren't cheap these days... Any way just a few thoughts from a dumb ol' Texas boy... Maybe some of this helps... Maybe it don't... As they say... "Your mileage may vary"

Yesterday, 06:14 PM	#33
Bob F Junior Member Join Date: Sep 2007 Location: Bucks Co Pa Posts: 66 Likes: 16 Liked 14 Times in 10 Posts	Re: Rear gear question Its a 440” LS with 4.125 stroke

Yesterday, 07:09 PM	#35
1320racer VIP Member Join Date: Nov 2007 Location: New Jersey Posts: 2,005 Likes: 90 Liked 555 Times in 267 Posts	Re: Rear gear question There?s no question, more gear, higher shift, maybe a converter but not before real data via a data logged but not a 3 speed trans.