1986 Ford Bronco II Lagging - Drive Train & Driveline

Question: Transmission Problem: 3 speed + OD automatic is loosing power after 30 minutes of driving, down to 10 mph on <5% grades. The longer it drives(hotter it gets) the slower it gets. Transmission has been replaced twice in 3.5 years by local professional. Truck is never taken off-road or abused, normal in-town driving only. I was told years ago and have since forgotten that there is a trick or special part that has to be installed just-so to get a transmision install right. Obviously, my local expert/professional does not know what it is. What is that illusive special trick/part on these 86 Broncos?

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Technican: Is the tranny in OD when this happens?If so, try to manualy downshift to see what happens.I'm not sure if there is one available for your year and model, but yes there is a "chip" made that can be installed to help performance on newer models that I know of.You may also want to look at your actual engine performance.Check compression levels on each cylinder.If there is a 10-15% difference between any of them, you're engine may be getting a little tired.The reason I say this is because you have replaced the tranny twice in a short period of time.The 5% grade you mention puts alot of strain on both the tranny and engine.If the engine aint thumpin, the tranny wont be pumpin. Paul

Owner: Let me clarify, it is a transmission installation problem, not an engine problem. The engine was the first thing checked before each replacement. A stock part of the tranmission that I understand to be fairly unique to this truck has to be installed correctly or the trans' overheats and wears out quickly. No way should I go through 2 trans' in less 3.5 years if installed correctly by a knowledgeable pro'. I need to know what that unique part of the trans' is so that I can tell a new trans' tech to lookout for it.

Technican: O.K. you say the tranny is overheating. The part you are speaking of, I'm not real familar of ever hearing about.Here is the e-mail address of of a trans specialist that builds strictly Ford trannys that my be able to head you in the right direction worked with this individual for many years in my dealership days and have full confidence in his work and experiance. Paul

Owner: Are you sure of the email address ? I got an undeliverable. See below: The original message was received at Fri, 12 May 2006 09:19:59 -0400 from mxip08a.cluster1.charter.net [209.225.28.138] ----- The following addresses had permanent fatal errors

Technican: Sorry about that.Try his website at www. johnwoodautomotive.com He's a Powerstroke specialist but I know this guy knows Ford trannys like the back of his hand. Paul

Owner: I contacted the website, www. johnwoodautomotive.com, as you suggested and have not gotten a response.

Technican: I'll try and personally contact him.I'm not sure if he went on vacation.Will let you know. Paul

Owner: Did you get in contact with the Ford transmission expert? Thanks.

Technican: I'll do a drive by in the AM.Last time I tried he was already closed or on vacation for Memorial Day.Sorry for not getting back sooner.My computer has been down for the last week.Will give you a responce tomorrow. paul

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1986 Ford Bronco II Lagging - Drive Train & Driveline

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