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Old 10-09-2018, 09:36 PM   #11
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I didn't have room to get a mechanical in there, just not enough room. I was able to get a puller fan in. Still working on getting the exhaust figured out, but did drive it a little today. She tops out at about 65, but will do it all day long, lol. She runs out good, and I can;t wait to see how she does pulling the trailer this weekend. One other thing, what would everyone suggest for a better transmission? I have been thinking of finding a road ranger 7 spd with a double overdrive. final drive is like .68. I was also thinking about changing the rear end gearing to 3.83 or 3.55 instead of the 4.11 that is in there now, but I don't want to sacrifice my pulling power. Ideas?
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Old 10-10-2018, 09:43 AM   #12
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As far as double OD manuals are concerned, I don't know of any that are less then 13 speeds.

Not really sure why you'd want a double OD manual anyways. You can get 7 speeds with a single od of .75:1, and they even have .65:1 options. Granted the spacing between the gears is pretty wide so make sure the engine powerband will work with it.

Pulling an at545 though, maybe a new double od allison will be a better option for you. Look up posts by cadillackid, He swapped iirc an at545 for an allison 1000 in his bus and did a write up on it.

My idea? Find an online gearing calculator, get your current information, and play with the ratios to see what will work best for you.
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Old 10-10-2018, 09:51 AM   #13
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What he said...for sure!


Don't play "guess the gearing". You can spend a bundle and come up really unhappy unless you do your homework first. Run ALL the numbers on an online gearing/speed calculator. Not just top end...but every gear. Much cheaper than swapping out two or three gearsets or trannies.
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Old 10-14-2018, 08:11 PM   #14
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very true. I'll start running some numbers. Used her to pull the camper this weekend, and she'll run 60 all day long up hill and down, but she's running really close to the governor doing it. She has plenty of power to offer, and I even liked the way the 545 did pulling the camper, just need to get a little more speed out of her and drop the RPMs. i haven't had a chance to run gearing numbers yet, but hope to do that in the next day or so. I'll post up a driving video and a few more pics after my phone charges. Thanks again everyone.


https://youtu.be/a07UfEFrTPI
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Old 10-14-2018, 08:27 PM   #15
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Don't forget to also play with tire diameters. Often you can pick up some top end/lower your RPM's with just a drive-wheel tire change.
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Old 10-15-2018, 08:59 PM   #16
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Tango makes a good point. Do your due diligence before putting your money down.

I have a truck that is "overgeared". It has a six speed transmission that rarely sees sixth gear and get it's best fuel economy in fifth.

I spent the day moving trailers around the lot and found that having tall gears makes backing trailers up a real pain.

Do it right the first time
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Old 10-21-2018, 09:38 AM   #17
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Quote:
Originally Posted by thumper_65590 View Post
Thanks Booyah. I got to looking at the driveline, and I think it is the angles on the final driveshaft, it has short and at quite an angle. i haven't checked the exact angle yet, but its pretty steep. Does anyone know what the optimal angle for a driveshaft is. Thanks again
THe number of U joints in shaft determine the proper angle (if any)






Lots of information on this page Tom Wood's Custom Drive Shafts - Driveline 101
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Old 01-25-2019, 03:54 PM   #18
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I've wanted to do a swap like that for a long time. Granted, it's only 170hp now, but if you crank up the power any, that combo of transmissions will grenade. I would highly suggest an RTO6610 if you like a bunch of gears(10 speed), or one of the FSO variants for manual trans choices. For auto, an Allison 1000 would be great, or for a less costly alternative, an MT653. As mentioned, gearing calculators will be key.
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Old 02-25-2019, 08:49 PM   #19
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Well, I had some issues with the driveline, actually I had a crossmember break on the spicer, and let me tell ya, when it hit the ground at 70, things got a little exciting. Anyway, I figured since I have to redue the driveline anyway, it is time to upgrade the transmission possibly. I found an Allison MT643. Would this be a better transmission that the 545? Let me know and thanks, William
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Old 02-26-2019, 01:49 PM   #20
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Yes, the 643 is better then the 545. It's also substantially larger as well, so make sure you'll have room to fit it in the truck frame rails, fire wall, and floor board.
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