Hey Y'All ! What would cause the 747 tranny to slip while accelerating from between speeds of 30-40 mph only ? (I've changed the fluid & filter fairly regularly). Granted I've got about 385K mi. on the rig and a general rebuild is most likely due, but I'd like to put that off 'till it's really necessary. Thanx

 

The intermediate band needs to be adjusted.

Fortunately for you, the IB is externally adjustable, unlike the low/reverse band where you would need to drop the pan to access it.

 

If that does fix it then I would highly recommend getting ready to do another fluid/filter change and tighten the low/reverse band as well.

385K, wow, that as of right now is the only van I have seen/read about that has 21K more miles than mine. How long have you owned it? I bought mine with 330K 3 1/2 years ago.

 

Thanx guys .... I went to ck. my odometer & it's only 382.7K (!). Anyway, I got mine in the spring of '97 with about 78K on it & it's been my constant companion toolin' around town and cruisin' long trips. It was previously owned by a Jeep/Mopar mechanic. I've had very few problems with it.

 

Oh also, last fluid/filter change I added some of that Lucas Trans. stuff upon hearing good things about it. The company recommends that you add it every fluid change (not surprisingly!). Is that really advisable ? Doesn't it do it's thing adequately the first time ?

 

Also, Mobile Auto Repair, in your response where you wrote :"If that does fix it then I would highly recommend.....", did U mean to say, "If that doesn't fix it ......" ?

 

I've read that lucas tranny fix has helped some transmissions which were on their last legs, but I certainly would not use a little every pan drop.

It is basically very thick goo which changes the fluid's viscosity.

LUBEGARD RED is a well respected transmission additive. I think Lubegard is one of the few additives companies that are not just snake oil salesman with an excellent marketing team, and budget.

 

No I did mean it the way I wrote it. Reason is if the intermediate band is loose then IMO the low/reverse band may be close behind in getting ready to slip. I am the type that does not mind fixing a current non existent problem instead of waiting for it to happen.