Tranny questions? - Ford Powerstroke Diesel Forum
 
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post #1 of 5 Old 08-21-2013, 06:48 PM Thread Starter
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Tranny questions?

So I'm at a loss here with my buddies truck, it's a 99.5 8" lift on 38x13.5's, dp tune runnin on the 120 tune, frx,hpx, ww2, t500 hpop, 4" straight pipe, intake , 6.0 trans cooler, jw valve body, mag hytec deep pan and slightly beefier tq converter, now my question is why would the trans temps be around 180 with normal driving on a low to mid 70's day steady driving when my truck with similar engine mods but not as much done to tranny and only on 35's hit like 150? Do the 38's with out being re geared make that much of a difference?

99 7.3, 6" stacks, 37x13.5 km2s, ev boost, trans temp and egt gauges, 6637 intake, tw tunes, cnc fab 4 line fuel feed kit, hpx, boost fooler, john woods valve body, triple disc billet tq conv, swamps idm, MB hoop, comp cams 910-16 valve springs .030 shims, smith brothers pushrods and PIS 250/200's, PMF stage 2 gusseted trac bars, 4" icon lift
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post #2 of 5 Old 08-21-2013, 07:13 PM
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There are too many variables there for a straight forward answer. Sometimes my trans hits 160-190 on seemingly similar days in nearly similar conditions. In a perfect test between your two trucks, the following would have to be identical to compare your apples to his oranges: weather, location, driving habits/driver, time of day and so on.

Does your truck have an external remote bypass? Some dont allow full flow until it is satisfied at a certain temperature (example: mine is 180)

38s without a re-gear would cause the trans to heat up more (but again, too many variables to say how much exactly).


2001 7.3L
Pro Comp 6.5" Lift
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35x12.5 Nitto Mud Grapplers
Sky Jacker Hydro 7000 Steering Stabilizers
K&N CAI JUNKED For A 6637
Straight Piped Dual 4"
Jasper 4R100 (Rebuilt in '05)
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Dieselsite Coolant/Trans Filters
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post #3 of 5 Old 08-21-2013, 07:15 PM Thread Starter
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Same day n only about 5 minutes apart same route n driving style, I drove em both

99 7.3, 6" stacks, 37x13.5 km2s, ev boost, trans temp and egt gauges, 6637 intake, tw tunes, cnc fab 4 line fuel feed kit, hpx, boost fooler, john woods valve body, triple disc billet tq conv, swamps idm, MB hoop, comp cams 910-16 valve springs .030 shims, smith brothers pushrods and PIS 250/200's, PMF stage 2 gusseted trac bars, 4" icon lift
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post #4 of 5 Old 08-21-2013, 07:19 PM
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The tire size will make a difference as well as the internals of the trans if it's been rebuilt. My guess is one of the trucks has the water to oil cooler built into the radiator and the other doesn't. Like mentioned above, there are too many variables to say for certain, could be anything from mud on the cooler to a stuck brake making the truck work harder.

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post #5 of 5 Old 08-22-2013, 06:41 PM Thread Starter
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Both trucks are air to oil cooled both have perfectly clean coolers an brand new brakes n calipers that's why I was curious if the 38s would make that much of a difference

99 7.3, 6" stacks, 37x13.5 km2s, ev boost, trans temp and egt gauges, 6637 intake, tw tunes, cnc fab 4 line fuel feed kit, hpx, boost fooler, john woods valve body, triple disc billet tq conv, swamps idm, MB hoop, comp cams 910-16 valve springs .030 shims, smith brothers pushrods and PIS 250/200's, PMF stage 2 gusseted trac bars, 4" icon lift
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