95ttoplt1

iTrader: (3)

Hey guys I have started looking into what tranny I will need next.

I have the lowly LT1 and no I am not swapping to a LS1

My new motor will be

370 LT1 (4.030x3.625)
6.125 Eagle rods
Cola Crank
Diamond Pistons
All Pro 227 "Nascar" CNC'd to 255(2.055/1.68) rolled 2 degrees
Vic-E intake
Lemmons Headers
Solid roller custom from AI
At least 300hp of nitrous.

Car is full weight about 3500#

I really want to keep the same platform as the 4l60(lock-up, over drive, PCM controlled) but I am worried that it won't take the power for one and it won't take the RPMs(8500-9k) that I will be turning.

Some have suggested to swap to a 4l80e but will I be in the same boat as far as the RPM capability?

Can the stock Lt1 PCM be modified to control the 4l80e??

Sponsors if you have a tranny that would fit the bill feel free to PM me

smoknta

Just curious, but what PCM are you running? No way to stocker can go up that high. Sounds like you're gonna have to go with an aftermarket ECM, but I dont know if they can control the tranny, can they?

95ttoplt1

iTrader: (3)

I have a Gen 6 DFI, I know old school but it fits the budget and does all I need it to. I still have the stock PCm for controlling the 4l60e at the moment and to run the dash and such. But maybe a switch to Gen 7 with the 4l80e or a TCI T-com if I can't get the stock PCm to run the shifting show.

ChocoTaco369

just a question, but why would you want to rev a pushrod motor to 8500-9000 rpms? they're not designed to make power that high. you're better off redlining at 7,000 rpms, 7,500 max.

and i would think that no 4L60E is going to take a 9,000 rpm redline for long, i don't care who builds it. that's ridiculous. they were designed to see 3,000 rpms LESS.

95ttoplt1

iTrader: (3)

I'm not planning on using a 4l60

Pushrods are fine, if set up correctley, and my heads and top end flow enoght to support power that high, and the bottom end is built to handle it.

ChocoTaco369

when you made the thread you were considering it...

i'm sorry, but i'll believe it when i see it. i highly doubt your car will make power up to 9,000 rpms with an OHV motor, especially in an LT1. it's just pointless to me. you can run 9's shifting at 7k and your engine will be infinitely more reliable. show me a bearing an an OHV motor that likes being spun to 9k. more power to you if you do it. my own biased opinion is that i forsee a headache.

95ttoplt1

iTrader: (3)

Thanks but I was never considering it, I am looking for alternatives.

Thanks for the info.

SVT THIS

iTrader: (27)

I'm not really sure of the rpms that the tranny can take, but from wanting to keep a lockup stall and OD it sounds like this will be more than a track car. From that standpoint, I too have to ask why you want to rev so high? It will not be fun to drive on the street if it's power is from 5-9k. The joy to driving these cars on the street is the low end torque that takes you from 30mph-70mph in a couple seconds without creeping up past 2500rpms.

I would believe that a 4L80e built right should be able to handle, but I am not a tranny expert. Yank had a full manual 4L80e built to 1k hp in the for sale section, give them a call about a custom build. FYI it will probably be around 3k minus the stall, swap parts and installation. Good luck

95ttoplt1

iTrader: (3)

Thanks for the info, I know 9k sounds high and it is, but that is the absolute max the car will see ever. I want to shift about 8k, but have the cusion to do more.

I simply don't think I can make the big power down low as I am only running a 370cid, not the 396 or 408+ that alot of you guys are running. So I have a set of Nasty heads and what ever cam that AI grinds for the car, and they know I want to turn it fast. Please understand that there isn't much LT1 left in the combination, most is converted SBC stuff.

It seems ubsurd and it is But I'll give it whack, I can always put a smaller cam in it