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Doug
Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 6899
Experience:  Mitsubishi employed and Factory trained ASE certified technician
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Just rebuilt 01 diamante 3.5l with f4a51 trans, shifts great

Customer Question

Just rebuilt 01 diamante 3.5l with f4a51 trans, shifts great but very delayed engagement nuetral to rev nuetral to dr
Submitted: 1 year ago.
Category: Mitsubishi
Expert:  Doug replied 1 year ago.
Hi,
Are you using SPIII fluid in the new build or Dexron/Multicar/etc?
Customer: replied 1 year ago.
atf+4 fluid
Expert:  Doug replied 1 year ago.
Thanks, ***** ***** is going to pose a problem. These transmissions are extremely sensitive to the fluid, requiring SPIII. You can use Dexron in a pinch with primarily only long term effects, but Type 4 in particular is problematic immediately.
Never the less... I assume the fluid level is correct when hot of course? Do you have a set of line pressure gauges so we can see what the pressure is doing when you select a drive range?
Customer: replied 1 year ago.
I have used atf+4 fluid in these transaxles numbers times without any issues.
Expert:  Doug replied 1 year ago.
That's good, you really shouldn't though.
Either way.... line pressure gauges?
Customer: replied 1 year ago.
Yes I have gauges but I have to leave shop now be back in morning
Expert:  Doug replied 1 year ago.
No problem.
When you get in tomorrow, I'd like you to hook up to REV and LR then move the shifter from Park to Reverse and monitor the pressures for delay to see how quickly they rise and to what peak.
Then hook up to UD and move the shifter from Park or Neutral into Drive and again see how quickly they rise and to what peak pressure.
I will be in off and on tomorrow, so just post when you have some numbers for me and we can pick up as shortly.