Hi all, transmission failed. We bought a used one and put it in, it does not work at all. I have another that was rebuilt 20 years ago and never installed, it is a V730d. I will swap the tail and the valve body. I am putting it in a 1969 pd4107, with an 8v71. Do I need to worry about the rotation of the transmission? I am pretty sure the bus is LH rotation.
Your engine is left turning post the model number and some one here can tell you here if it is a right hand V730,I doubt you have one though they were only found in the RTS with the 6v92TA and series 50 engines
Right hand v730-v731r or rh, has about an additional 3 to 4 inch extension on the input side which contains reverser gearing.
what system do you have to select n,r,d 1,2,etc? A shift lever or a push button keypad?
Hi, the tag says
Today I will swap the valve body and tail housing. It's there anything I need to know, or worry about?
Do you have gaskets ? why the valve body change
Like luvrbus says "why the valve body". I have changed the valve body several times and it is easy but about 40 bolts. I was always able to reuse the gasket without any problems if it comes off in one piece which it probably will.
Thank you. Do you know if the trail housing will swap in one piece?
The tail housing will swap out very easily. I assume you have a different one with speedo take off etc.
Yes, the one I am taking off has a two wire governor. I need to put on the shaft with the regular governor.
You do know any Allison dealer can Dyno the transmission and then you will know if the transmission is good or not and they can set the shift points before installing it, still trying to figure out why you are changing the valve body
The valve body on this one is different. The shift selector tab it's not on this one. It also had a plug in for electric. It looks like some kind of 730-731 hybrid conversion that I an reversing. I hope this makes sense. I can post a picture of the two side by side, In about a half hour.
My post didn't post so here it is again.
I found the easiest way to remove the rear housing is to use a floor crane and stand the trans with the rear housing straight up. You will need a gasket for this one or you can make one from a sheet of gasket material. The housing isn't very heavy so no need for a crane to lift. I assume you have the V730 manual which shows the inside of the trans.
Sounds like you have a V731 which is identical inside except for the valve body. I have switched the 730 and 731 valve bodies with no issues. Just make sure you put all the bolts back in the proper holes.
I just relooked at the tag on the trans and somebody has switched the valve body to the electric version to make it a V731. Now you are putting it back to the original V730 trans. Easy to do without any problems.
yep he has a V731 not a V730 ,Bill he may run into a problem changing the valve body from a transmission that wasn't working the valve body could have been the problem with the other transmission and I have no idea if he tested the pressures or not
I was thinking the same thing. I do have two to choose from
Thank you Bill, this is great info for me.
also, since you have a stone bennet shifter, it could possibly be the origonal problem.
I would assume you did some testing for pressures etc before you condemn the original trans. Around here nobody can test a V730 anymore. They have gotten rid of the adapters for a V730. The only way to see is install and test with a gauge at the appropriate port. I hope you have the V730 manual if not maybe Ebay has one.
https://www.ebay.com/itm/284111641233?hash=item42265f9a91:g:u1kAAOSwQqRf02sv
Does anyone know of a person close to Hawthorne Florida, that knows this transmission? DDA in Ocala does not have the ability to dyno or mess with shift points. Or maybe someone who I can explain everything that has happened too?
Mike 406-876-3583
Check around Tampa. I had one dynoed but don't remember where.
Bill Gerrie gave me a call. Lots of great information. We had a great conversation. Thank you Bill.
My pleasure Mike. Anytime.
Good Morning All, does anyone have a rebuilt Allison v730 for sale? The one on eBay for $3350 is not available. The one on eBay for $1900 just looks scary. I am in Hawthorne Florida. I have three transmissions lined up side by side. Is there anyone or does anybody know anyone, who is knowledgeable, that would actually come here and make one out of three? Yes I know I am reaching.
Have your transmission rebuilt by Allison-not cheap, but then you know what's in the transmission. I turbocharged by 8V-71 so it puts out (with 7G75 injectors) 375hp and 1125lb/ft torque. United Transmissions (unfortunately not in business anymore) rebuilt it with that in mind and the trans takes the power easily. Keep in mind that the V730 is just a HT740 without 1st gear-using the same gears and clutches, plus with reverser gear. VERY dependable transmission. Good Luck, TomC
Thank you for the info