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Old 09-11-2008, 02:34 PM   #1
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Airstream Isuzu Diesel THM475 vs 700R4

Has anyone replace the THM475 transmission with a 700R4??? I see that the THM475 is a 3 speed and the 700R4 is a 3 speed with a 4th gear over drive .70 to 1. Seems to me that would be real nice with the Isuzu Diesel.

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Gary Greenwood
Leslie, MI
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Old 09-11-2008, 02:39 PM   #2
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Cheaper to install a over/underdrive. The 475 is not a bad transmission, but with the
addition of Allison parts, it's great.
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Old 09-11-2008, 05:16 PM   #3
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The 700R4 is a weak link. I would shy away from it. It is not recommended for use in heavy duty load carrying or towing situations, and that is what you will be doing 100% of the time. You would have to leave it in 3rd gear, which defeats the purpose of the overdrive.
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Old 09-11-2008, 06:28 PM   #4
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I think 700 r4 is a bad choice, Why not use a 4L80e. I think the bell housing is the same. Reliable already has a High volume pump, will keep cool under a load.
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Old 09-11-2008, 06:34 PM   #5
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I think 700 r4 is a bad choice, Why not use a 4L80e. I think the bell housing is the same. Reliable already has a High volume pump, will keep cool under a load.
4L80E is the same bell housing, but is electronically controlled. It could be done, but would no longer be an "easy" swap.
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Old 09-11-2008, 07:02 PM   #6
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Umm, all the expert suggestions are from trailer people?
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Old 09-11-2008, 07:20 PM   #7
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Umm, all the expert suggestions are from trailer people?
I decided the content of this post was a little too brusque, and have removed it. So, no, you weren't imagining there was something else here...
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Old 09-11-2008, 09:19 PM   #8
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I decided the content of this post was a little too brusque, and have removed it. So, no, you weren't imagining there was something else here...
Ahh, come on Terry I wanna see what you wrote......

Bottom line is the 4L80E would take a fair amount of work to control it. Ok, maybe not so much work as money. Something like a grand to get a custom control board for it. I have one sitting on the shop floor that I eventually plan on putting in one of our motorhomes, just not sure which one yet .

Brad
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Old 09-11-2008, 10:05 PM   #9
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I decided the content of this post was a little too brusque, and have removed it. So, no, you weren't imagining there was something else here...
Got not from that comment.
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Old 09-12-2008, 06:20 AM   #10
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Got not from that comment.
I'd had a really bad day, and took your comment above the wrong way. Moderators can completely remove their posts (or anyone else's). I removed the sharp response I posted stating my qualifications, but felt that ethically the post should remain, rather than being swept under the carpet.
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Old 09-12-2008, 07:45 AM   #11
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4L80E is the same bell housing, but is electronically controlled. It could be done, but would no longer be an "easy" swap.


You had better inform millions of street rodders because there all doing it, and have been for a few years.

They are also useing 4L60 E also. For this application I wouldnt because
a more heavy duty service life is needed. Heck any O/D tranny is fair game now.

If you are worried about the computer control. We all narmally bypass the lock up converter and put a switch on it, so when you are on the freeway you can manually put it in OD.

However they sell a little unit that will do everything like it was original equipment.
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Old 09-12-2008, 08:23 AM   #12
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Mustang,

Would you mind elaborating on the "little unit" that is being sold. I have always planned on setting the one I have up with a switch for manual control of the lockup feature. What I haven't found is something I'm happy with for controlling the shift points (mainly at a reasonable price!).

Thanks!

Brad
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Old 09-12-2008, 11:30 AM   #13
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Any good tranny shop can hook you up with an after market on board computer. BD deisel makes one for about $325.00


I am personally going to put a s 10 (T5) tranny behind my flathead 6. Unless I decide to sell it first (41 plymouth)


As far as the switch goes any tranny shop can d that also, or anbody that works on trannys. Really Easy
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Old 09-12-2008, 12:25 PM   #14
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I'd had a really bad day, and took your comment above the wrong way. Moderators can completely remove their posts (or anyone else's). I removed the sharp response I posted stating my qualifications, but felt that ethically the post should remain, rather than being swept under the carpet.
No harm done, we all get a little testy, myself included.
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