what's it like with a th400 and no overdrive
#3
I am doing a TH400 right now, and I have 3.73's. Get a different rear end gear? What will I lose or gain other than lower RPM's at higher speeds? Will it still launch hard
It will have a:
TCT 4000 stall
200 shot
It will have a:
TCT 4000 stall
200 shot
#4
If you have a 4l60e in your car just drive around in third gear, its the same final drive ratio as a 400.
rpm will be 300 rpm higher than what you find it too be without a lock-up converter.
rpm will be 300 rpm higher than what you find it too be without a lock-up converter.
Last edited by Hotrodhawk; 12-16-2004 at 07:08 PM.
#5
Originally Posted by Hotrodhawk
If you have a 4l60e in your car just drive around in third gear, its the same final drive ration as a 400.
rpm will be 300 rpm higher than what you find it too be without a lock-up converter.
rpm will be 300 rpm higher than what you find it too be without a lock-up converter.
#6
gearing
Originally Posted by MeanWS6
I am doing a TH400 right now, and I have 3.73's. Get a different rear end gear? What will I lose or gain other than lower RPM's at higher speeds? Will it still launch hard
It will have a:
TCT 4000 stall
200 shot
It will have a:
TCT 4000 stall
200 shot
#7
I turn 3000 rpm in third gear [4l60e] at 70 mph without locking the converter.
...yes its frick'n loud
You should have been around when we didn't have OD transmissions, 2800~3000 rpm at highway speed was a norm
...yes its frick'n loud
You should have been around when we didn't have OD transmissions, 2800~3000 rpm at highway speed was a norm
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#8
If you do the math...gear ratio times OD ratio times 336 (lock up) or 355 (no lockup) times mph divided by tire diameter, you get close to a 800 rpm difference. It varies with speed, etc.
I see almost a 1000 rpm gain when I go from OD locked up to drive not locked up.
So you could be looking at around a 700 to 1000 rpm difference.
I used to cruise my nova down the highway at 4000 rpm and 90 mph with open headers, this was on the way to the track. Only did it twice so far, I could drive across the country like that
I see almost a 1000 rpm gain when I go from OD locked up to drive not locked up.
So you could be looking at around a 700 to 1000 rpm difference.
I used to cruise my nova down the highway at 4000 rpm and 90 mph with open headers, this was on the way to the track. Only did it twice so far, I could drive across the country like that
#11
I drove 500 miles in one day with my th400 and 3.73s.. it was loud as hell and annoying. 3500-4000 rpm the whole way! With the th400 i am putting in my new car I am going with a 3.23 gear so highway cruising won't be that bad.
#12
ratios
Originally Posted by aram
I drove 500 miles in one day with my th400 and 3.73s.. it was loud as hell and annoying. 3500-4000 rpm the whole way! With the th400 i am putting in my new car I am going with a 3.23 gear so highway cruising won't be that bad.
#14
Joined: Nov 2003
Posts: 6,166
Likes: 217
From: Wichita KS / Rancho San Diego
Let me put it this way: in my 69 GTO w/3.23s, I drive at about 65mph @ 3000 rpms onthe KS turnpike. In my 00 Formula w/3.42s + OD, I drive at 80mph @ 2500 rpms.
#15
Originally Posted by MeanWS6
I am doing a TH400 right now, and I have 3.73's. Get a different rear end gear? What will I lose or gain other than lower RPM's at higher speeds? Will it still launch hard
It will have a:
TCT 4000 stall
200 shot
It will have a:
TCT 4000 stall
200 shot
T400 and 3.70's here. I drive on 275-60-15 BFG DR's everyday. I cruise at about 70-75 at 3200-3400 rpms. Id never go back to an OD trans.
#16
ive been thinking the same thing and im prob going to go with a 430 gears in my 12 bolt and just keep my 10 bolt with 3.23's and in racing season leave the 12 bolt in and non racing season, put the 10 bolt in there.... i thought that would be good for me
#17
Originally Posted by Hotrodhawk
I turn 3000 rpm in third gear [4l60e] at 70 mph without locking the converter.
...yes its frick'n loud
You should have been around when we didn't have OD transmissions, 2800~3000 rpm at highway speed was a norm
...yes its frick'n loud
You should have been around when we didn't have OD transmissions, 2800~3000 rpm at highway speed was a norm
#18
Originally Posted by Dave00C5
Hell with 4.56's 4k was normal back then!