Quote:
Originally Posted by carringb
FWIW - Nothing makes the trans temps skyrocket faster than backup up a trailer. Combination of tall reverse, no lockup function in reverse, and the radiator basically sucking up hot air when backing makes it shoot up fast.
|
I was recently told the same by the tranny builder who just rebuilt my Expedition trans. He said if you want to really care for your tranny (in a 4wd) ALWAYS put it in 4 low when backing a trailer, especially a heavy trailer or uphill. Anyway, temps will probably still rise but it's much easier on the components and distributes the force.
Not to change the subject, but as a 20 year tranny builder with an impeccable rep (yeah, I know, try to find
that anywhere!), he said that the 4r75 in his mind is a very tough tranny. This is the one in most F150s and Expeditions, and I think in the 5.4 vans too. He also said the 4r100 is brutally tough and that the 5r110 is so good that he's never rebuilt but one of them. By the way, he does a lot of work, several a week and rebuilds for 13 shops. What was it on? A dually truck used by a marina to back heavy boats uphill in to their parking places.
He's actually a Chevy guy but believes strongly in the 4r100 and the 5r110, which he says is probably stronger than the Allison.
The above info is opinion, mind you, and worth just what you paid for it.