Hello I have a 78 W-150 regular cab short bed with a 440. Trucks appears to be all original drive train. I just found the original build sheet in the seat. According to the sheet it was built for the feds. Also under the engine section it says 440 476. Does anyone have an idea why it says 476 next to 440? Also under trans it say A508 which I have never heard of. So if anyone has an idea on what the trans is. Thank you

 

Welcome, if the vehicle was built for the Feds, anything is possible with the specifications the Feds may have requested.. I do think the a508 may be a 727 transmission with an overdrive option. Maybe someone else with know exactly..

Good luck..

 

Welcome to the forum..... Be sure to check out the Mopar of the Month contest... The Feds get anything they want so, I can't answer your questions... Maybe someone else can help.....

 

:welcome2: Bob will know the answer to your question... He works for the Government...LOL...Bill... Just busting on you buddy...How are things???

 

Myraman the trans Is not an overdrive unit. Thinking maybe lockup converter. Also truck has 3:23 gears and at 65 im around 2300 rpm on 33 inch tires

 

I'm Good Bill.... I'll Call you this weekend........

Is the block maybe a 1976 Block?????? Not really sure what the 476 is......
I think the A508 Trans is a later trans like 1990'ish.....

 

Not sure of the #'s They never made a 518 overdrive for the big Block

 

Heres a pic of what I got