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Old 12-14-2012, 06:28 PM   #1
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How to remove the engine from a motorhome

Hi, me again. I going to buy a early to mid 90's motor home and have couple more question. Most of the motorhomes I'm looking at have 454 chevys with over drive trannys. I believe that in the early 90's, chevy started using the 4l80e in there truck chassis. Is this correct?
Also, I think I could get the tranny out ok if it every needed rebuilt, but how does one remove the motor from a motorhome? Have any of you seen or heard how this is done? I hope I never have to replace a motor in one, but you never know when you are buying something this old. Thanks
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Old 12-14-2012, 06:32 PM   #2
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Some garages remove the drivers door and take it out the top and some jack the front end way up and remove the front suspension and take it out the bottom. I like the bottom better.
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Old 12-14-2012, 06:47 PM   #3
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Quote:
Originally Posted by crankitup View Post
Hi, me again. I going to buy a early to mid 90's motor home and have couple more question. Most of the motorhomes I'm looking at have 454 chevys with over drive trannys. I believe that in the early 90's, chevy started using the 4l80e in there truck chassis. Is this correct?
Also, I think I could get the tranny out ok if it every needed rebuilt, but how does one remove the motor from a motorhome? Have any of you seen or heard how this is done? I hope I never have to replace a motor in one, but you never know when you are buying something this old. Thanks
early 90's was the 4L80. Mid 90's was the 400 trans.
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Old 12-14-2012, 09:19 PM   #4
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Some garages remove the drivers door and take it out the top and some jack the front end way up and remove the front suspension and take it out the bottom. I like the bottom better.
Also sometimes passenger side windows removed and take it out that way.
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Old 12-14-2012, 10:04 PM   #5
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early 90's was the 4L80. Mid 90's was the 400 trans.
you have that backwards chief
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Old 12-14-2012, 10:06 PM   #6
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Removing the engine isnt that hard. Worst case you remove the intake manifold, then the heads leaving just the shortblock assembly. Trans is pretty easy. My old coach I could see all the bellhousing bolts from the doghouse cover.
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Old 12-15-2012, 10:30 AM   #7
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I believe the carburated 454's used the 400 Trans.
GM went to the 4L80E electronically controlled trans when they replaced the carb with fuel injection (TBI or rail).
By 1992 they had gone to TBI fuel injection. 1990/91 was a combination of carb and TBI based P30 chassis.

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Old 12-15-2012, 02:23 PM   #8
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The common trans used in P30 chassis MH was the TH475(Also refered to as the 3L80 or 3L80HD).
The TH475 is basically the same as a TH400, but it main difference is its straight cut sun gears instead of helical cut.

Most 454's are removed thru the front of the MH using a lift plate bolted to the intake to minmize the height of the lift assembly.
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Old 12-15-2012, 08:10 PM   #9
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The two 454 i rebuilt out of a Winnebago came out the front . The first one i did i took the top end off first. Reinstalled with out intake. The seconed one i pulled intake and used plate i had made from first one they are a pain to do lol
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Old 12-15-2012, 08:20 PM   #10
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The common trans used in P30 chassis MH was the TH475(Also refered to as the 3L80 or 3L80HD).
The TH475 is basically the same as a TH400, but it main difference is its straight cut sun gears instead of helical cut.
They also have/had a heavier torque converter, at least the outer casing...
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Old 12-16-2012, 10:11 AM   #11
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you have that backwards chief
Our 95 has the 4L80E trans...
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Old 12-17-2012, 11:00 PM   #12
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Our 95 has the 4L80E trans...
My 98 had it. Think all chevy truck units from 92 on had them. Saying the 4l80E came before the TH400... is like saying carbs came after fuel injection.
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Old 12-18-2012, 06:23 AM   #13
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It seems as though this thread has gone from "how to remove an engine" to a discussion of transmissions.......
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Old 12-18-2012, 07:37 AM   #14
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you have that backwards chief
Todd you are right. It ain't there first time I said something bass ackword's
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