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1984 Winnebago Chieftain transmission not engaging

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I have a 1984 Chieftain that has been sitting for 10 years, but it did start and drive around the yard. But today when I tried it the transmission wouldn't engage. It would rev up while in gear, but no response from the trans in any gear. Linkage is all good. Anyone have any suggestions to try?

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If you can check the fluid level. 

2000 National RV Sea Breeze 5th wheel 30ft.


1950 F1 street rod

1949 F1 stock V8 flathead

1948 F6 350 chevy/rest stock, no dump bed shortened frame.

1953 chevy 3100 AD for 85 S10 frame

1968 Baha Bug with 2.2 ecotec motor 170 hp, king coil-overs,etc

1970 Baha Bug wihg 2332cc, King coil overs and everything else there is.

1998.5 Dodge 2500 4x4 Cummins, turbo, trans, injectors, lockers, bigger turbo,edge EZ upgrades for towing 35" BFG's, air dog lift pump etc.

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When cold the ATF should be at the low line, when you get it driveable and the transmission is hot, only then should it read full.

After sitting 10 years the seals are dried out and probably leaking.


2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country.  John F. Kennedy 20 Jan 1961


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I believe that you have a GM, P-30 chassis and this link is for the chassis service manual.

If you do not have one, here is a copy of the brochure that you can also download.

I do believe that this owner's manual is also for your motorhome. 

Good travelin !...............Kirk

Full-time 11+ years...... Now seasonal travelers.
Kirk & Pam's Great RV Adventure



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  Sitting for 10 years !!!!!!! Like others said check the tranny fluid ?? While in general Im NOT a fan of snake oils, I have used Lucas Tranny Fluid additive and to my pleasant surprise it actually worked !!!!!!!!!! and may help lube or soften up some seals ???  See what any transmission experts have to say, that's NOT me.................

 John T

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