'73 1510 5spd direct in 5th


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Post Sun Sep 27, 2020 5:41 pm

'73 1510 5spd direct in 5th

Would like to convert from factory 4 spd. The 1510's kind of a cross between the 1310 1ton and a 1600 loadstar. Just wondering if perhaps a loadstar transmission would fit or if input shaft is different. Thanks - Bill.

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Location: Western North Carolina

Post Wed Oct 07, 2020 3:51 pm

Re: '73 1510 5spd direct in 5th

There is no such thing as a "Loadstar transmission".
Transmissions are identified in a few different ways:
IHC Code - 13427
IHC Model Number - T-427
Mfr Model Number - T-19
Those are all designations for the same transmission.

A 5-speed transmission as used by IH in their light line trucks will fit and were factory installed in the IH Pickup trucks & Travelalls. The input shaft is larger in diameter, therefore is uses a different pilot bearing.
It is a larger transmission and therefore uses a different bell housing than the 4-speed units.
It typically uses a different flywheel in the Loadstar to accommodate either a 12" or 13" clutch.
In the light line trucks, it typically utilizes an 11" clutch, due to the much lower vehicle GVW.

So, to swap from a 4-speed to a 5-speed you will need to do some additional work than a simple trans swap might indicate.

You would need to properly identify any donor transmission prior to starting your swap to be sure your transmission was the correct unit.
My Junk --> 1975 IH Model 200HD, 1 ton 4x4 truck, 392, 4 speed, etc.
My cave location --> Western North Carolina

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Post Sun Oct 25, 2020 12:18 pm

Re: '73 1510 5spd direct in 5th

Well that's what I was wondering. Thank you for the reply.

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