Need tranny Advice

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Jun 25, 2009 | 02:55 AM

CanadianSmokie

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From: Nova Scotia

Need tranny Advice

After installing the DP Tuner and under hard acceleration, the transmission shifts extremely hard from 2nd to 3rd with a slight delay before shifting up. What would be the most likely cause for this?

Thanx... don't want to prematurely take out the tranny.

Jun 25, 2009 | 04:28 AM

Monsta

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Reduce the shift pressure. Did you change the shift points or rev limiter with your DP as well?

Jun 25, 2009 | 07:27 AM

CanadianSmokie

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No, I didn't request anything special with Jody in regards to tranny shifting. I know he automatically firms up the shifts and locks the TC better. I haven't been able to get the PCM reprogrammed for the bigger tires which, if I understand correctly, affects transmission shifting and ABS function somewhat.
Can I take it to a transmission shop for them to reduce line pressure? Or could it be the solenoids acting up?

Jun 25, 2009 | 02:10 PM

Monsta

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From: Washington State

Why can't you make adjustments yourself with your tuner? I can adjust shift pressure with my SCMT, surely the more advanced DP tuner can perform that function as well...right?

Jun 25, 2009 | 06:58 PM

CanadianSmokie

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Nope, DP's not a programmer it's a pre-programmed chip woth a shift on the fly controller....

Surely there must be someone on here that has tranny experience....

Jun 25, 2009 | 09:55 PM

Monsta

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From: Washington State

Quote:

Originally Posted by CanadianSmokie

Surely there must be someone on here that has tranny experience....

Gee thanks...

Why don't you call up Jody at DP and see what he says? I doubt it is the tranny itself since it didn't do it prior to you putting in the DP tuner.

Jun 26, 2009 | 04:16 AM

CanadianSmokie

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Wasn't meaning any disrespect Ken, but you were pointing me to programming which I don't have access to...

Jody's been away so I haven't been able to contact him but I did do a search on the 7.3 forum and Springer Pop seems to have a good explaination of what the problem is. The accumulator valves get worn out and can cause irratic shifts. The reson I probably didn't notice it before (other than the slow shifts), is because I wasn't putting enough power through the tranny to have it come up hard like it does at times. It only happens at WOT... other than that it shifts good.