Stall speed effect on hwy rpms?
04-03-2007, 08:35 PM
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Stall speed effect on hwy rpms? Going with a th350 or th400(most likely th350). Would like to go with a 4000ish stall because I enjoyed it before. My question is what effect does the rpms on the hwy with a 3000 converter vs the 4000.
I am shooting for simply being able to keep my rpms around 3000 at 70mph. I only drive the car once a month on the interstate to guard duty 150 miles and I can handle turning some rpms and going slower just to have a trans that will be reliable.
I'm still running 3.23 gear and will be still running a 26in tall tire when I change over to welds(right now ZR1s). Will also be using a 232/234 cam with this setup as well.
Thanks.
I am shooting for simply being able to keep my rpms around 3000 at 70mph. I only drive the car once a month on the interstate to guard duty 150 miles and I can handle turning some rpms and going slower just to have a trans that will be reliable.
I'm still running 3.23 gear and will be still running a 26in tall tire when I change over to welds(right now ZR1s). Will also be using a 232/234 cam with this setup as well.
Thanks.
04-04-2007, 08:08 AM
#2
In a non-lockup situation, a 4000 stall is going to use about 200 - 400 rpms more on the highway than a 3000 stall, depending upon the design of the 4000 stall. You'll see the higher end of the range regularly if you drive through hills.
I've seen lock-up TH 400s. Yank had them, don't know if they still do.
I've seen lock-up TH 400s. Yank had them, don't know if they still do.
04-04-2007, 06:14 PM
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Originally Posted by Ragtop 99
In a non-lockup situation, a 4000 stall is going to use about 200 - 400 rpms more on the highway than a 3000 stall, depending upon the design of the 4000 stall. You'll see the higher end of the range regularly if you drive through hills.
I've seen lock-up TH 400s. Yank had them, don't know if they still do.
I've seen lock-up TH 400s. Yank had them, don't know if they still do.
What is a better type to look for as far as "design" of a large stall like a 4000. Is cruising the interstate in the stall going to cause any issues or be a lot different as far as mileage vs being out of the stall?
Thanks for the input sir!
04-04-2007, 07:27 PM
#5
Originally Posted by Ragtop 99
In a non-lockup situation, a 4000 stall is going to use about 200 - 400 rpms more on the highway than a 3000 stall, depending upon the design of the 4000 stall. You'll see the higher end of the range regularly if you drive through hills.
I've seen lock-up TH 400s. Yank had them, don't know if they still do.
I've seen lock-up TH 400s. Yank had them, don't know if they still do.
I had a TH400 in my car at first with a special tail housing so same driveshaft, same crossmember (for me). Easy install.
04-05-2007, 06:42 AM
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Originally Posted by BlackHawk T/A
When the clutch is engaged there is no RPM difference. Mileage will remain the same.
What clutch engaged on a th350/th400 that is nonlockup?
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04-05-2007, 08:01 PM
#9
By design, some stators will produce a faster roll-off than others. They tend to have shorter shift extensions but feel tighter when driving. I've had a Yank YTP 4200 and an SS 4200 and the YPT felt looser but its long shift extension and high efficency made it killer from a roll.
A lock-up unit is the way to go.
Frank, those variable pitch are definitely old school. Are you showing your age?
A lock-up unit is the way to go.
Frank, those variable pitch are definitely old school. Are you showing your age?