Im trying to find a transmission from a salvage yard and everyone of them asks me if its an MCP or MJP, i've searched here and googled it and can't find any answer.

 

I researched this since Ive never heard of it as well as making a few calls to some ppl who would possibly know the answer and so far Ive came up with zip. However, an educated guess is that it could be two things.....one being the designation between a 2wd unit and a 4wd unit (doubtful IMO). The other could be the HD version of the 80E. You can get an 80e that is considered light duty in the trucks that are 8k lbs GVW or the HD version for the trucks rated at over 8k GVW (HD=different helical cut on the gear train for one thing...you can hear a slight whine at low speed). The letters you listed may be the factory designation of either the HD (over 8k lbs GVW) or light duty (under 8k GVW) 80e.

Other than that I havent found anything yet.

 

Have you asked the people at the salvage yard what the difference is? If they are asking you, it would make sense that they would know.. but i have been wrong before

 

I was thinking something like that also. Its a little odd because the only time it asks for which one on car-part search is when you search for a 2005 model vehicle and its only on a 6.0 liter 2wd applications.

If there is no information out here on the web about it then i guess the difference has to be pretty small.

Oh, and yes i did ask the salvage yard and they didn't know either. Its just one of the questions that their computer needs to know when they are looking for the part.

 

There is a 4l80e and a 4l85e. MAybe these are the designations for each??

peace
Hog

 

The difference may be bolt on yolk versus slip yolk , only a guess.

 

Why would you bump a 12yr old thread with just a guess?

 

MCP was for a short wheelbase vehicle. Slip yoke only

MJP was for long wheelbase vehicle. The longer wheelbase vans had a 2 part driveshaft and therefore they got a bolt on yoke. (a slip on yoke will still work fine)