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-   Pre-Power Stroke Diesel (7.3L IDI & 6.9L) (https://www.ford-trucks.com/forums/forum117/)
-   -   Allison at545 6.9 diesel (https://www.ford-trucks.com/forums/876565-allison-at545-6-9-diesel.html)

562dragnhra 08-15-2009 07:12 PM

Allison at545 6.9 diesel
 
i have a 6.9 diesel hooked up to an Allison AT545, what rear end gearing do i need to run??? right now i have a 3.00 rearend. 1st and 2nd are loooonng!!! and i have a RPM gauge that i got at the junk yard wondering how to wire it???

David85 08-15-2009 08:05 PM

Never looked up the ratios before. Looks like a nice tranny. I like the tall reverse ratio.


First 3.45:1

Second 2.25:1

Third 1.41:1

Fourth 1.00:1

Reverse -5.03:1

RATIO COVERAGE
Forward 3.45

*Gear ratio does not include torque converter multiplication
Source: http://www.utxchange.com/ALLISON%20T...T%20545(R).htm


What is the vehicle? a bus I assume.

I would say 3.00:1 could be a good ratio to preserve highway fuel economy, but it really depends on the total weight of the vehicle. You might have to go with lower gears.

562dragnhra 08-15-2009 10:45 PM

well the whole setup is on my 1977 F250,

David85 08-15-2009 10:50 PM


Originally Posted by 562dragnhra (Post 7833615)
well the whole setup is on my 1977 F250,

Oh......alright then, You will love it with 3.00 gears.

Thats gonna be one hell of a rig!

GenLightening 08-15-2009 11:22 PM


Originally Posted by 562dragnhra (Post 7832979)
and i have a RPM gauge that i got at the junk yard wondering how to wire it???

Was it out of a diesel? If so, you will also need the sensor that mounts in the IP housing. The wiring is pretty easy. The gauge has 4 connections, 2 are grounds, as is one of the leads from the sensor, the Sens connection will go to the other lead from the sensor. The last connection is 12v+ and goes to a power source.

562dragnhra 08-15-2009 11:35 PM

alright kool, oh and ya the tach came from a diesel,

ford390gashog 08-15-2009 11:50 PM

how is the ground clearance with that huge trans pan?

562dragnhra 08-16-2009 12:15 AM

Its level with the frame, and it has tha big deep pan too

1994diesel 08-16-2009 12:26 AM

ooh, pictures would be cool!

562dragnhra 08-16-2009 01:05 AM

i dont know how to post pics on this forum,, i took my truck to get my exhaust done out the hood with a 5" stack, and im running banks sidewinder turbo too

David85 08-16-2009 01:36 AM

You have a couple of options for posting pictures,

1: set up your own gallery, and upload the pictures there. Once in the gallery, you can post them in the thread by copying and pasting the "forum posting code". It will be shown as a link in your gallery below each picture.

2: if you have a file hosting account at a place like photobucket, you can post them from there.

LCAM-01XA 08-16-2009 03:34 AM


Originally Posted by 562dragnhra (Post 7833880)
i dont know how to post pics on this forum,, i took my truck to get my exhaust done out the hood with a 5" stack, and im running banks sidewinder turbo too

Hood exhaust is highly illegal for a street vehicle in any state, keep that in mind if you ever plan on driving the beast on public roads.

Mat J 08-16-2009 08:59 AM

go to photobucket.com and upload pictures then copy the img code here, we want to see this beast :)

562dragnhra 08-16-2009 04:52 PM

Really its illegal??? i see some trucks have them, dnt have oics of my truck yet but i will post it up once i get my truck done guys:-drink

Mat J 08-16-2009 08:45 PM

exhaust has to exit behind the b pillar on the cab for on the road use. I belive that is every state.


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