Pro's-Con's of AT 545 - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 5 (permalink) Old 03-30-2008, 03:48 PM Thread Starter
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Pro's-Con's of AT 545

I have been reading about no-lockup converter. I have a 92 IH bus with 7.3 and AT 545 trans. Do I need to change trans or am I OK for cross country trips with the AT545? :shrug:

The AT 545 is a SAE# 3 bellhousing. What other SAE#3 trans would work?
:thanks:

Project--1992 International School Bus Model 3700, IDI 7.3, Transmission Allison Model AT545, 94 IDI turbo, Fuel SVO
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post #2 of 5 (permalink) Old 03-30-2008, 04:01 PM
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lot's and lot's of 545 tranny's going up and down the road. cheap to fix, and easy to find a replacement for. they may not be the best performers, but they are fairly solid tranny's. service it out, and hit the road!
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post #3 of 5 (permalink) Old 03-30-2008, 07:01 PM
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The AT545 does indeed use an SAE #3 housing, but the 7.3L has a #2 to #3 adapter bolted between the FW housing and the trans, so you *can* use a MT 643 with their #2 SAE housing.

The AT is a durable trans, and IMO you should NOT spend the major $$$$$$$$$$$ to change it for a different trans for any reason, especially for a lock-up converter, it's simply not worth it, not at all.

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

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post #4 of 5 (permalink) Old 03-30-2008, 09:22 PM Thread Starter
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John_G do I understand you right that International use an adapter plate on the Motor mount to go from a #2 to the #3 Trans. I have not look that close for an adapter. The one thing for changing trans was some of the #2 trans had overdrive with more gears (6 speed) and were set up more so for a RV use.

Thanks for this information on the housing.

Project--1992 International School Bus Model 3700, IDI 7.3, Transmission Allison Model AT545, 94 IDI turbo, Fuel SVO
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post #5 of 5 (permalink) Old 04-07-2008, 03:46 AM
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Yes, most do step from a #2 to a #3.

As I recall, all DTs have a #2 standard, and a #2 to #3 adapter to step down if needed. I *think* a SAE #1 is optional with the DTs as well, but possibally only in the larger truck models.

The V-8s all had #2 FW housings as far as I know, with adapters obviously, if needed.

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin

I vote for LIBERTY!
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