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FWD fuse and rear diff question
Posted: Fri Aug 27, 2004 10:01 pm
by bretgem
Hi - I am just about done installing a used, and hopefully good tranny in my good old '90 wagon. I have a replacement rear diff (also from a '92) to put in since the tranny is a '92, but i wonder if I can drive the car in FWD by inserting the fuse, thereby giving me a little chance to see if the tranny works before i do any more work to the rear diff.
Will this cause any problem?
Thanks!
Bret
Posted: Fri Aug 27, 2004 10:02 pm
by THAWA
you shouldn't drive it like that, and it can and very well will damage the MPT Clutch (the thing that gives the rear wheels power).
Posted: Sat Aug 28, 2004 1:36 am
by Legacy777
I'm assuming this is an auto correct?
You could drive/test the tranny with the FWD fuse in. I see no harm in that.....
Posted: Sat Aug 28, 2004 6:51 pm
by bretgem
Hey guys - thanks for the feedback/info. Not sure which one to go with, since they seem to be differeing opinions, but the good news is that the new rear diff is in too -- making this an unnecesary question now! Still - I am going to be curious to know the answer in case I am ever in a similar situation. What does the fuse disengage?
If I can ask a somewhat unrelated question - - the tranny i pulled only has a bad front diff. Is a tranny with no front diff a marketable item? Has 139k on it - AWD from the '90 wagon. Also have the good replaced rear diff too.
Thanks again - Bret
Posted: Sat Aug 28, 2004 8:28 pm
by BAC5.2
A tranny with a blown front diff is good to someone who just want's the case. When you can get a tranny from a junkyard for $75 though, it's not really worth it.
Shipping a tranny is hard work.
Posted: Sat Aug 28, 2004 9:23 pm
by Legacy777
bretgem wrote:Hey guys - thanks for the feedback/info. Not sure which one to go with, since they seem to be differeing opinions, but the good news is that the new rear diff is in too -- making this an unnecesary question now! Still - I am going to be curious to know the answer in case I am ever in a similar situation. What does the fuse disengage?
If I can ask a somewhat unrelated question - - the tranny i pulled only has a bad front diff. Is a tranny with no front diff a marketable item? Has 139k on it - AWD from the '90 wagon. Also have the good replaced rear diff too.
Thanks again - Bret
Putting the fuse in the FWD fuse holder sends 12 v constant to the duty c solenoid which controls line pressure, power to the rear wheels. When the duty c solenoid gets 12 v constant it closes and there is no or very little power going to the rear wheels. Not enough to cause damage.
Posted: Sat Aug 28, 2004 11:03 pm
by vrg3
I think the only part that you risk damaging is the duty solenoid C itself. In normal operation it's never run at 100% duty cycle so it might overheat or something.