| Author | Message | ||
| Stephen Gutknecht (Roundsparrow) (66.112.31.93)
Rating: N/A |
In response to a old thread in the archives I posted archive 741 thread We have decided to stick with the 4 speed as a replacement. Now a new problem... We are going to http://www.industrialautomatic.com/ in Irving, Texas to get our tranny replaced. Several people (other Bluebird Wanderloge owners) have recommended them. I read the plate to the service manager: > HTB 741 > Serial: > 2510095838 > Part No: > 23019924 > 85J06 And he puches "2510095838" into the service computer and he says Allison recommends a 748 as a replacement. My 1985 printed Allison brochure says the 748 is only rated for 365 HP where the 741 is rated for 445 HP. However, even Bluebird 2 years later used the 748 with a 475 HP 8v92. So did the later years of the 748 go up in HP rating? Stephen Gutknecht 1987 Bluebird Wanderlodge, 8v92 with HTB-741 | ||
| Peter Broadribb (Madbrit) (67.136.90.190)
Rating: N/A |
Stephen, Give Allison's techline a call and get the info direct from them. 800-252-5283. Peter. | ||
| Gary Carter (68.25.31.154) Rating: N/A |
My allison sales literature if 9/91 and has in one area shows the 741 at 445HP and the 748 at 365HP. However in the last page it shows the 748 at 445HP and 1435 lb ft torque. Our Newell has a 500HP DDEC with a 740 box. What does this all mean? I don't really know. | ||
| Stephen Gutknecht (Roundsparrow) (66.112.31.93)
Rating: N/A |
I'll call Allison, but frankly, I don't trust a "single answer" from them any more than others  I'm likely to get some person who hasn't even seen a model 19 years old Corporate America. My 1987 Bluebird clearly came with a HTB 741, which another owner confirms on his too. But the same engine with DDEC is shown in the http://www.vintagebirds.com/1988.htm next year Bluebird brochure with the MTB 748. I don't get how a 365HP maximum tranny should be mated with such an engine. Is the "MTB" different than the "HTB"? | ||
| Stephen Gutknecht (Roundsparrow) (66.112.31.93)
Rating: N/A |
ok, I called Allison, but they won't answer me! They said that I would have to have my service shop call them.... I suspect they don't want to be in the middle of a conflict between service shop and customer. UGGH! | ||
| Peter Broadribb (Madbrit) (67.136.90.190)
Rating: N/A |
You can try again and hope you get a different technican. The one I spoke with did advise me to talk to the nearest Williams Allison dealer to get all the ins & outs, he worked with the current trannys, but he did run a couple of SCAANS for me and sent me info. As for the HTB and MTB, I thought the M (medium duty) was for the 600 series and the H (heavy duty) was for the 700 series. Don't recall seeing a 700 with anything with an M. Peter. | ||
| Stephen Gutknecht (Roundsparrow) (66.112.31.93)
Rating: N/A |
Follow-up... I've two other 1987 / 1988 Bluebird owners whith the same engine / chassis (PT40, 8v92TA). And in their case the factory did put in a 748. So my conclusion is that the 748 is acceptable despite the specs being better for the 741. One thing I know for certain, and that is the 741 is a rather rare beast - I find very few references to them on the Internet (busses for sale, owners doing repairs, etc.) My guess / further speculation is that Allison had some shortage back in 1986 and the 741 was substituted (more expensive but drop in replacement). But pure speculation. Thanks to all. | ||
| David Anderson (168.215.176.236) Rating: N/A |
Tell Allison that you are Stephen from Williams Truck Transmissions. Works for me all the time. After all you are a repair guy in your own mind, right? David Anderson |