Has anyone put a A-518 or one of the RH series of transmissions in there truck. Was it worth it, noticeable mpg improvement? How much fabrication for the trans cross-member?

 

Is it worth it? That would depend on how and where you drive the truck. I don't do much highway driving or even flat land driving so it would not pay me to swap. Here is a good article that might answer some of your questions. Be aware that the gear ratios listed for the overdrive have an extra zero and should read .69 to 1.

http://www.hemmings.com/mus/stories/...feature15.html

 

Thanks for the article.

I can get a A-500 for $100 with the lower first gear. Think it will hold up behind a 350-400hp 318 in the truck used primarily for towing/ hauling.

 

I wouldn't even consider that. The A-500 is considered a light duty transmission. It was primarily used behind 6 cylinders and small V-8s in smaller or lighter vehicles.

 

I'll find a A-518/ 46RH and see what kind of MPGs I get.

 

just had my auto trans with overdrive rebuilt i get about 15-17 on the highway with cat back dual exhaust 318 magnum

 

Whoa, what have you done to your 318 to produce that kind of power? just curious as I am into all the go fast goodies

 

Nothin yet. There is an article that I am going to use as a guideline and other peoples builds.

http://www.carcraft.com/techarticles...ine/index.html