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Gear vendors overdrive in Travelall

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74travelall

Farmall Cub
Joined
Mar 10, 2020
Messages
46
Points
18
I am about to pull the trigger on ordering a Gear Vendors overdrive but wanted to check to see if I am missing something regarding fitment as they do not make one specifically for IH. Some details:

- 1974 Travelall 100 2wd
- 727 with a 18.5” tail housing
- I was going to order the 727 truck/towing 2wd overdrive listed to replace an 18.5” tail housing with a slip yoke and no parking brake

I have read that there might be differences in the output shaft diameter where the tailhousing bushing or bearing sits on the Travelalls and trucks compared to non-IH applications but was not sure if that is true and if so did it apply to the 2wd version?

I am trying to ensure that I am aware of any potential issues prior to placing the order. Does anybody have experience installing a gear vendors overdrive in a Travelall with a 727? Thanks
 

74travelall

Farmall Cub
Joined
Mar 10, 2020
Messages
46
Points
18
3.07. Pretty good already but on the highway at 75 or so keeping pace with most traffic I am just under 3k RPM. I would like to drop that down as I spend a ton of my time on the highway. I don’t think it will be over geared given the torque curve of these engines but I will find out. At least with this overdrive I can control it manually or put in auto mode where it kicks in at a set speed.
 

C.R.Glow

Farmall Cub
Joined
Mar 12, 2021
Messages
18
Points
3
I have 3.73’s in my ’72 travelall with a 727 trans, so I’m very interested in this swap, thanks for posting
 

scoutboy74

Lives in an IH Dealership
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Mar 10, 2004
Messages
7,357
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Daze Crick, Jefferson
This doesn't answer your question, but in the full size rigs, the TF727 output housing and shaft is the same for 4x2 and 4x4 due to the divorced transfer case in the 4x4 models. It is an IH specific housing and shaft though. I have no idea regarding your fitment question. What does the vendor have to say about it?
 

mallen

Lives in an IH Dealership
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Sep 26, 2012
Messages
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Location
Sacramento,California
That's a pricy upgrade. I'm curious how it will work out. I so have to ask, are there any overdrive automatic options for an sv?
 

MrKenmore

Lives in an IH Dealership
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May 19, 2013
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Long Island, NY
Not sure of pre 74/75 but I believe the tails of the TF727 were different for 2WD vs 4WD. 2WD being longer.

4WD
Screenshot_20210430-060636_Adobe Acrobat.jpg


2WD
Screenshot_20210430-060609_Adobe Acrobat.jpg
 

RinTX

Dreams of Cub Cadets
Joined
Jan 19, 2013
Messages
4,670
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Location
Ft Worth, TX
That’s interesting- the different lengths. Makes you wonder why with the divorced transfer case.
 

J.J.

Lives in an IH Dealership
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Dec 14, 2003
Messages
10,765
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Location
Castalian Springs, TN
At one time, I was considering a GV unit on my '73 4x4 Travelall, it never got done. From my then research, it would have been on the back of my NP 205 and would have required a massive shortening of the rear drive shaft. The Travelall driveshaft is very short to begin with, it would have taken 15-16 inches out of it.

Perhaps the over all shortened 727 case had to do with the driveline angle, although in all the ones that I have owned I have not noticed a difference in the tail shaft. Ill have to look at what I have to see.

Also the obvious too, the front part of the case is the same for the Scout application, just again the tailshaft different to mated vs divorced.

JJ in TN
 

Zaedster

Farmall Cub
Joined
Oct 4, 2014
Messages
163
Points
43
Location
Grass Valley
True 1974-75' 2WD PU/TA's used a slip yoke style rear tail housing vs fixed yoke found on the 69-75' 4x4.

That is a lot of money for that overdrive unit. You will still have to get a new driveshaft.
 

74travelall

Farmall Cub
Joined
Mar 10, 2020
Messages
46
Points
18
Thanks for posting the pages from the parts manual. For some reason my parts manual is missing the 2wd tail housing pages. From the diagram it looks like the 2wd uses a bushing and the 4wd uses a bearing. The 4wd tailhousing in my manual shows both a bearing (28 in the diagram above) and a bushing (30) at the rear end of the tailhousing but states the bushing as NA. The 2wd with the longer tailhousing only shows the bushing. I thought the “normal” non-IH 727 used a bushing. I would love to have the dimensions (ID and OD) of that IH bushing to be able to discuss with Gear Vendors to confirm that the bushing (or bearing) in their replacement tailhousing has the same ID. Anybody know those bushing dimensions or have an output shaft handy from the longer 2wd version they can measure the diameter? I guess I could pull the tailhousing and measure the output shaft and bushing but that seems like a real pain just to put it back together to be able to drive while I am waiting on the overdrive.
 

74travelall

Farmall Cub
Joined
Mar 10, 2020
Messages
46
Points
18
At one time, I was considering a GV unit on my '73 4x4 Travelall, it never got done. From my then research, it would have been on the back of my NP 205 and would have required a massive shortening of the rear drive shaft. The Travelall driveshaft is very short to begin with, it would have taken 15-16 inches out of it.

Perhaps the over all shortened 727 case had to do with the driveline angle, although in all the ones that I have owned I have not noticed a difference in the tail shaft. Ill have to look at what I have to see.

Also the obvious too, the front part of the case is the same for the Scout application, just again the tailshaft different to mated vs divorced.

JJ in TN
On my 74 2wd Travelall the driveshaft is one piece and is around 55” long.
 

74travelall

Farmall Cub
Joined
Mar 10, 2020
Messages
46
Points
18
I just got off the phone with Gear Vendors and walked them though my details and questions. The tech was confident it would work with my vehicle given the details I provided. I took the plunge and ordered the overdrive. I will post here the details of the install once complete.
 

mallen

Lives in an IH Dealership
Joined
Sep 26, 2012
Messages
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Points
113
Location
Sacramento,California
You might have to relocate the transfer case and have the rear drive shaft shortened. If it won't work with the tail shaft housing you have, you might be able to swap it out for one that will work.
 

Jesse Stewart

Farmall Cub
Joined
Jan 10, 2021
Messages
471
Points
43
I have a wonder about the 46RH Trans .. ??

1619917423144.png
 

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