Looking for Allison HT740 transmission - what do I need to look for (and where?)

[daveola]

I need to replace the Allison HT740 transmission on my MCI 102A3 bus (6V92)

I've found rebuilds for around $4k, but I was hoping for something cheaper.

Some places tell me they need my serial number on the transmission to find one that matches, other places tell me I just need the right kind of HT740 (but then aren't clear about how to tell)...

So if I'm looking at other HT740s, is there something I need to look at to determine if it will work in the 102A3?  Is it possible for me to tell by looking at the other HT740s serial number if it's a match?

And any suggestions of how or where to find a solid used transmission?  I see them on ebay for about $1k, which would be a nice price point to hit.

[muldoonman]

Don't know, but a good rebuild for $4000 bucks in a bus seems like a steal. Heck, I paid $2600 for a trans in a ranch 1 ton a couple years ago at a chevy dealership.

[Jeff Willard]

I'd be real careful about just "Finding one". There are so many types of converters, valve bodies etc that you need to really know what you're getting. You don't want to end up with a transmission out of a garbage truck that was set up to do stop and go every 50 ft and never exceed 45 mph. It wouldn't work too well in a coach. I've heard all the naysayers about putting automatics in old GM's like I have. I've heard of massive fuel economy losses etc. I think it's because they went junk yarding and found what ever was cheap.... and would bolt in. I have a Scenic in my shop now that has an HY740 with horrible downshifts. I suspect it was a "bolt in" out of god knows what. I haven't even looked at it yet but, we'll see.

If what you have has been working, I'd get it rebuilt. $2000 sounds like a deal to me. Otherwise.... it's a crap shoot, and an expensive one at that.

[Jeff Willard]

OOps. Typo. I meant $4000 for a rebuild seems like a good deal.

[luvrbus]

OOps. Typo. I meant $4000 for a rebuild seems like a good deal.


Any 740 will work you may need to change the shift points which is no big deal.Penske are $2800.00 United are around $3200.00 exchange

[B_K]

I know where you can buy one for $3000 and drive it where you need it to swap it. Comes in an MCI w/rebuilt 8V71 !

[Tom Y]

I have one, but would like to see 1500 for it. It was set up for a Cummins 2000 rpm, so it may not be good for you. 15K miles on it , the Allison shop did it up for me for $4500.  It is in Pa.   Good Luck

[daveola]

I know where you can buy one for $3000 and drive it where you need it to swap it. Comes in an MCI w/rebuilt 8V71 !

*chuckle*

I take it you are selling your bus?  I doubt it would make sense cost-wise to pay to pull the transmission, and while I wouldn't mind a rebuilt engine, I don't think I want to go from a 6V92T to an 8V71...

[daveola]

$4000 for a rebuild seems like a good deal.

It probably is a good deal, but that doesn't mean I have $4000 right now.. 

[daveola]

Any 740 will work you may need to change the shift points which is no big deal.

Do you know where I can find more info on how to do this?   Because if that's the case, it's not hard to find a 740 that looks like it's in great shape for $1k, but I am presuming it wouldn't otherwise match my bus.

Jeff - do you know of anything besides the shift points that could be different between 740s?  And where I can find info on how to even figure this things out for a given serial number?

[luvrbus]

Shift points are easier to set on a Dyno but dealers are charging around $500 to do it,all you do turn the trimmer valves so many clicks to set the shift points to match the rpms and speed.

If you are low on funds don't worry about the shift points now you can shift manually with the shiftier then  when the funds are better you can pull the pan and set the shift points installed in the vehicle.
Any 740 or 747 will work for you if it is from a on the highway vehicle,the numbers just tell the tech what torque converter and any special order that was made to the transmission.Read the tag if it says HT 740 or HT 747 no other letters like RS it will work

good luck 

[daveola]

Any 740 or 747 will work for you if it is from a on the highway vehicle

Does that disqualify military transmissions then?  Because there are quite a few 740 military transmissions in good shape that are cheap.

the numbers just tell the tech what torque converter

Doesn't that also matter?  Won't that change the shifting ratios?

[luvrbus]

Does that disqualify military transmissions then?  Because there are quite a few 740 military transmissions in good shape that are cheap.

Doesn't that also matter?  Won't that change the shifting ratios?

No a military 740 will work for you they just have a high stall converter and most are from behind the 8v92 engines don't worry about the shift points right now it won't be that far off

[opus]

Try Clarence:  513-605-0101  "I have for sale 4 ht-740 tranny,s all good out of MCI, also have a 8v71 for standred for sale"

I know nothing, just saw it and remembered this post.

[B_K]

I take it you are selling your bus?  I doubt it would make sense cost-wise to pay to pull the transmission, and while I wouldn't mind a rebuilt engine, I don't think I want to go from a 6V92T to an 8V71...

Not my bus but one of my Amish neighbors.
They bought the bus loaded up and took a trip out west.  (a neighbor went along an did the driving for them)
Coming home they over heated it in Colorado. They ended up at a small diesel repair shop where the guys were all ready overbooked with regular customers work.
But the owner of the shop told them if they'd do most of the work themselves he'd loan then the tools needed and guide them thru it.
So they took his advice and rebuilt it beside the shop with help from the guys in the shop. Plus they put two NEW radiators in it as well.
When they got home to TN the bus was parked and has sat unused since. The owner had me take pictures and post them a while back. He just wants to sell it and get some of the $ he put in it back.