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What transmission fluid for Allis 20-35?

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=159531
Printed Date: 13 Apr 2026 at 12:36pm
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Topic: What transmission fluid for Allis 20-35?
Posted By: Jacob (WI,ND)
Subject: What transmission fluid for Allis 20-35?
Date Posted: 31 Mar 2019 at 8:50pm
Hi all,

I previously asked around and found out that the general consensus for engine oil for the 20-35 is either straight 30 weight, or 15w40 diesel engine oil.

OK, now how about the transmission?
I don't believe I have asked this one yet, and I wasn't coming up with anything by searching.

What do you all run in your transmissions?

Trying to get all these details figured out for start up this summer, thanks!


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Jacob Swanson
1920 6-12; 1925,1926 20-35 longfenders; 1925,1926 15-25's; 1927,1929 20-35 shortfenders; C; B's; IB; WC's; WD; WD45



Replies:
Posted By: Dave H (NE)
Date Posted: 31 Mar 2019 at 9:24pm
Jacob. I use 140 trans oil in mine. Dave


Posted By: Jacob (WI,ND)
Date Posted: 08 Apr 2019 at 10:10pm
Thanks Dave, I keep meaning to call you to catch up.   It's been a while.  One of these days, I swear.

Anyone else have a 20-35 with fluid in the tranny? LOL


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Jacob Swanson
1920 6-12; 1925,1926 20-35 longfenders; 1925,1926 15-25's; 1927,1929 20-35 shortfenders; C; B's; IB; WC's; WD; WD45


Posted By: SteveM C/IL
Date Posted: 09 Apr 2019 at 9:29pm
I put 80-90 in my UC.The stuff that was in there musta been original.Resembled plastic roofing cement. Had to dig it out.


Posted By: Darrell G (MN)
Date Posted: 10 Apr 2019 at 11:48am
It was a substance called extra heckela, Mobil still makes it, I took 80-90 and poured in a pail and used a mixer on a drill and put gun grease in it and mixed to make it thicker, works great. 4-11-19 update.  I found more info and Extra Hecela was 600 wt oil. I found records that I used 80/140 and added gun grease, 600 wt is quite thick, however it helps with remaining on the gears for lubrication.


Posted By: allisrutledge
Date Posted: 10 Apr 2019 at 1:05pm
Jacob, I looked for the barrel I used in my A but it is long gone I suppose. I'm 99 percent sure it was 140 wt also.

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Allis Chalmers still exist in my mind and barns


Posted By: NEVER green
Date Posted: 11 Apr 2019 at 8:44am

I am going to use 140 wt gear oil and a couple gallons of that thick Lucas.

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2-8050 1-7080 6080 D-19 modelE & A 7040   R50       


Posted By: Jacob (WI,ND)
Date Posted: 13 Apr 2019 at 10:04pm
Thanks for the advice, all other advice is welcome.  I realize not nearly as many guys here are running these old ones as say WD's or whatever.

For reference to others that may be seeking this info, this document says the transmission holds seven gallons of oil.  Which sounds about right because I know we drained out over five gallons worth of sludge from mine and it was not full.

Link, see page 18:
http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1004&context=tractorpower" rel="nofollow - http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1004&context=tractorpower


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Jacob Swanson
1920 6-12; 1925,1926 20-35 longfenders; 1925,1926 15-25's; 1927,1929 20-35 shortfenders; C; B's; IB; WC's; WD; WD45


Posted By: Leesok
Date Posted: 13 Apr 2019 at 10:25pm
000 pourable grease in all pre 40 trannys and rear ends around here.



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