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Old 11-14-2012, 06:24 PM   #15
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Whilst working at RV repair facility our biggest issue with the GMC units was front end wear. They are Tornado, Eldorado front wheel drives. Outer shaft bearings mist replaced part.

And forget trying to drive in snowy conditions!!

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Old 12-03-2012, 03:18 PM   #16
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i have owned and restored a few of these, there GREAT, but you had better be a gear head or have DEEP pockets. you will spend at least a year to get it right. the first few years used 455 the later units had the 403 block not as good. the frames will rot out but can be replaced. the two biggest problems are front wheel bearings & bushings and pins at rear bogies. good luck have fun . ken

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Old 12-03-2012, 05:21 PM   #17
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I was always envious of the GMC motorhome, back in the day. They are a great design. Correct me if I'm wrong, but weren't the interiors completed by other RV manufacturers?.

Regarding the loss of traction, I have helped push GMC's on packed snow, and wet grass.

Originally Posted by wickedrevs 56 View Post
...And forget trying to drive in snowy conditions!!
George Schweikle Lexington, KY
1999 Safari TREK 2830, FMCA 190830, Safari International chapter
1995 Safari TREK 2630, 1983 Winnebago Chieftain, 1976 Midas Mini
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Old 12-03-2012, 06:09 PM   #18
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my question where did he say revcon did i miss it
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Old 12-03-2012, 06:14 PM   #19
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Originally Posted by George Schweikle View Post
I was always envious of the GMC motorhome, back in the day. They are a great design. Correct me if I'm wrong, but weren't the interiors completed by other RV manufacturers?.

Regarding the loss of traction, I have helped push GMC's on packed snow, and wet grass.
Just saying...new DW and I looked at the GMC in 1975 and wished we could someday have one and that lifestyle...we won't be getting a GMC, but that thought stayed with us for 37 years and we pick up our DP, going full time, in less than 30 days

All because of the then new, and dramatically different GMC look, in 1975.
Dave and Beth
2015 Cornerstone 45J
Ford F-150 and 2016 Polaris Razor
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Old 12-13-2012, 06:38 AM   #20
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gmc options

hi folks, im new to the board and my opinion is not yet evaluated. i myself looked for a gmc for a few years here in alberta canada. i found several factors that utimately changed my target for resto...

so many new products are avaiable to you to help with power. the least followed engines are available now but there is still abut 10 times more stuff available than before. if you are setting a budget for mechanical improvement you could rebuild a 403 that is close to 500 hpand double the original gas milage, for real and resonably inexpensive, most could be accomplished by just top end work. if you are in an area where propane fuel prices out to half of mid grade price you could assemble a upgraded prpane system and be driving at darn close to 1/4 original driving costs.

in my self intro on the newbe forum i asked about switch pitch converters,and what members may know or forgot about these unique set ups. what is interesting here is some of the eary gmcs got them, they were underappreciated and some times removed just to justify the bill. 15 years ago i put together a 37 mpg Imperial gallon(15%larger than us gallon) 3/4 ton truck gmc former 350 diesel with a olds 403 which never had less than 2 complete engines in the back, day in and day out. people used to think propane was 10% less efficency and 10% less power but we now know that the power and effency is back when you have 9.5-10.5cr. a good stage3 cam 265 degrees rv grind, roller rockers. i was on propane with a msd in cab timing adjuster, and i had swapped a switch pitch tranny and converter. heads had been ported and pollishedand hardened seats in the heads. the exaust was my own stye of x pipe. most everything was bartered/traded/swapped i drove it equel to 80000miles in about a year and a half, very flat most of the time, the next thing i was going to try was a turbo with ony 5- lbs boost to see if i coud find any more effecency. propane has up to 120 octane so afterbacking off the timing to start, i would pushit way up when it was warmed up the switch pitch was the icing just like a 4th gear, in one expirament i think i had it leaned out to 70mpg never to be repeated.

owners of older gm should learn how to spot the tannys. by putting in rv cam and this switch will be able to add econemy just for the price of a th400 rebuild
my 3quarter ton was stoled the next year i think tranny was used in drag raceing local top car
these trannys are comming out of rvs now as they are being stripped, allso ask tranny shops any 400 can be modified to work with converter read all history you can find in the net these trannys can take major torque.
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Old 12-13-2012, 01:16 PM   #21
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ugg me no make spell check work

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