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Old 05-09-2016, 09:10 AM   #1
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1977 24' Argosy 24
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Anyone Ever Replace 456 Rear End with 373 pn 24' MH?

My honey wants to replace the rear end (1977 Argosy 24' MH) in order to be able to drive faster on a long interstate trip. Doing 55 mph with everyone else going 80 mph is too dangerous.

Any suggestions from anyone with knowledge and/or experience will be greatly appreciated.
Elisa
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Old 05-09-2016, 09:31 AM   #2
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Biggest difference will be in the mountains. One reason for the 456 is maintaining a decent speed on the grades. Try a 410?
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Old 05-09-2016, 10:04 AM   #3
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You might want to investigate an overdrive unit first,it will allow you to keep the lower gears the mfg had deemed best overall
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Old 05-09-2016, 10:10 AM   #4
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https://www.gearvendors.com/ http://www.rverscorner.com/info/auxtrans.html
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Old 05-09-2016, 10:23 AM   #5
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It wont really hurt the 454 to run 4,000 RPM, but if the engine is a "peanut port" 454 it will probably be a real slug with 3.73s.

If it is a big port 454 it will probably pull the 3.73s.

A 1977 engine could be either one.

If the engine has been replaced with a new factory replacement, it will be a peanut port engine.


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Old 05-09-2016, 10:58 AM   #6
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Gear Vendor is the way to go. You will double your choice of gears. If your current trans is a 3 speed you will find second over a great thing in the hills.

Save the original drive shaft and remove the GV if you ever sell the MH. I sold my used one for 60% of what it cost. You won't get a dime out of a rear change.

Another consideration would be to contact BD in Abbotsford BC and see if their Torque Lock is an option for you trans. Pulling long hills with the convertor locked can really extend the trans life
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Old 05-09-2016, 11:41 AM   #7
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Rear End Change

Great idea!!! What I'm not sure of is what rear axle is in your unit. Thinking it is a GM 14 Bolt. If it is there are many aftermarket suppliers with ring and pinion sets in the $200 to $300 range. Vs $2500+ for a Gear Vendors. I would even go to a 3.42 or 3.23. Rock Auto has them all. I would not be too concerned about performance in the hills as your 454 will overcome just about anything. And you can always downshift. The ONLY concern I have is that it is harder on the transmission. The higher starting out ratio does cause more slipping and it will wear out faster. If your transmission is already high mileage be prepared to rebuild it that much quicker. One more thing-you may have to replace ring gear carrier to go to the faster ratio as one is offset a little to compensate for the different ring gears. There are only two carriers made. Readily available at most salvage yards. Again Great Idea!!!
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Old 05-09-2016, 11:50 AM   #8
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Before changing gear ratio to 3.73, check out Gear Vendor's overdrive. It bolts right to your TH400. To install, remove tail shaft housing and shorten the drive shaft. Best of all, you can split shifts like trucker's do. With increased RPM flexibility, your engine won't hafta work nearly as hard.

https://www.gearvendors.com/

Tom
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Old 05-10-2016, 11:02 AM   #9
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Great Idea!!!

Another option you may want to consider is to replace your TH 400(assuming this is what you have) with a 4L80E. You will have to research the particulars but I know certain models/years of this transmission can be installed on any compatible engine with an available electronic control unit. Or you can opt for a beefed up mechanical 700R4. Either of these will give you the final drive ratio of installing the 3.73s. Plus you will have a rebuilt tranny with overdrive for what a Gear Vendors would cost installed on your old unit!!!
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