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I finally got my rpm recorder working. Found I am only dropping 500rpm between 1-2 and 2-3 shifts on my t-400. I shift at 6400 and it drops to 5900. Converter slip works out to 12%. Cross the line at 6600.
Is this good enough? Or am I leaving some on the table? Is it worth sending converter back to tighten it up 500rpms? Anything else in the trans would cause this?

Converter is an ATI MRT 8". It was made for the car when I was at 10.90. I am now at 10.00/133 with taller tires. It 60's great off the t-brake, 1.36 60's leaving at 2800. Don't really want to give that up. Foot braking can only get 1.41.

I did limit the converter feed a few years ago when I was having thrust issues. Went down to .157. Would that lossen a converter?
 

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Doesn't sound horrible. Can you rev the motor a bit higher or do you want to? I don't think there will be huge gains in having the stall dropped by 3-400 rpm.


Hutch
 

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Me, personally think 12% sucks, should be more like 6% or less............

I think (IMO) it needs re done, get it alittle tighter and to get it more efficient .......

JUST MY OPINION......................
 

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I finally got my rpm recorder working. Found I am only dropping 500rpm between 1-2 and 2-3 shifts on my t-400. I shift at 6400 and it drops to 5900. Converter slip works out to 12%. Cross the line at 6600.
Is this good enough? Or am I leaving some on the table? Is it worth sending converter back to tighten it up 500rpms? Anything else in the trans would cause this?

Converter is an ATI MRT 8". It was made for the car when I was at 10.90. I am now at 10.00/133 with taller tires. It 60's great off the t-brake, 1.36 60's leaving at 2800. Don't really want to give that up. Foot braking can only get 1.41.

I did limit the converter feed a few years ago when I was having thrust issues. Went down to .157. Would that lossen a converter?
A couple things to try before you yank it out of there for the season. A simple fluid change to hi viscosity john deere hyguard or equivalent should bring the rpm drop down a little more (should be betwen 200-400 rpms). Try raising the shift point up another 500 rpm and see what the drop is. I agree with hutch the stall speed should come down between 500-800 rpm's.
 
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