Re: OT '90 Bronco tranney trouble

Posted by Brokenwrench on August 02, 2005 at 06:27:30 from (69.128.199.139):

In Reply to: OT '90 Bronco tranney trouble posted by RayP(MI) on August 02, 2005 at 04:35:03:

Hello Ray,
Sounds to me like a rolled overdrive sprag. This is a one way clutch in the tranny. It holds the overdrive planet from spinning in one direction while allowing it to freewheel in the other. The problem was, in the earlier ones it was a very loose fitting design that tended to fail. Around 95 they revamped the whole setup and the problem went away. When it goes over center it lets the planet freewheel in both directions. Why it starts out in "D" is because in that position it also engages the coast clutch, which holds the planet instead of the sprag. The reason you still have OD when you get up to speed is cause the sprag isn"t used in 4th. This will work for awhile but it puts alot of straine on the coast clutch, and that will end up failing too. This was probably the biggest achilles heal for that tranny, trouble is it aint a cheap fix. Usually the planet, sprag assemble, and drum are shot for sure. If you got someone that knows their stuff, with a little machining you can retro the late style setup into that tranny. As much as I hate to disagree with Allan, if the gov was stuck tight, you should still engage in OD. He is right about the govs being fussy on those units. But usually you"ll get high shifts, especially cold. Or you"ll get a wrong gear start from a stop. Hope this helps Brokenwrench

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