1992 Ford Bronco Slipping - Drive Train & Driveline

Question: only when shifting into reverse, there is noticable delay between the shift lever being moved, and the truck dropping into gear. Could be considered "slamming" into gear, as the truck jumps pretty hard going into gear. Somewhat better when warm/hot, only to reappear when cold. No problem in any of the forward gears, only reverse. 351 FI with 3 speed w/ electronic OD tranny. Ideas?

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Technican: I also have a 92 F150 and found my tranny was doing exactly the same thing. A filter change and new fluid and things were as good as new. Total cost was less than 50.00 and i was able to do the repair without even jacking the truck up. Al

Owner: I had a filter and fluid change, and it did not fix the problem. What's next?

Technican: So much for the easy stuff. I would next look to the Modulator valve. Disconnect it and see if the tranny reacts the same. If it does look for a broken or loose wires that connect into the Mod Valve. We can go from there. Al

Owner: will give the mod valve a try, please stand by, and I will let you know what happens. If it isn't the mod valve, what could it be? The fluid has a slight burnt smell now. I didn't detect the smell when the fluid was changed last, but this has been going on for a couple months, and not getting better on it's own. Thanks

Owner: OK, changed the fluid and filter, and made sure the driveline was tight - found a loose bolt at the drive shaft connection to the rear differential - neither helps at all. Still slams hard after hesitation when shifting into reverse. What I need to know is: What are the three most likely causes for this, and in what order should they be checked, both easiest to fix and least expensive first. I would think a ford technical rep would know what might cause this. A complete transmission overhaul to out of the question, as it will cost half the value of the truck. Thanks

Technican: Did you get a chance to also verify how tight the universal joints to the drive shaft were?? If they are really sloppy you will know it (there might be a very small amount of play) If not the problem then I recommend releasing the question because this is not as easy as it sounded in the beginning. .. let me know.

Technican: Hi; The transmiision you are talking about is a A4LD. This trans had a bad habit of the one way clutch tearing up the trans casing. The only way to fix it is have the trans overhaul. Check around and make sure the shop you deal with has experience at this trans. Or you can go the other route and get a used trans out of a salvage yard. .

Owner: How do you verify what trans it is? I just pulled a old hevy boat over 100 miles this week end, and every thing was fine except the reverse slam problem, which is much better after the fluid change and drive time. What makes you think this transmission needs a complete overhaul? How about some diagnostics here? Are you a transmission salesmen or what?

Technican: Hi; I worked for ford motor company for 6 years. I have found this type trans to bad a bad history. You might want to adjust the tv cable and see if it helps it any. .

Technican: Visit your local ford service department and have them give you a copy of a service bulletin that addresses your problem. TSB number 95137 dated jul/95

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1992 Ford Bronco Slipping - Drive Train & Driveline

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