S IIa Transmission Swap Questions - Defender Source
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  #1  
Old March 21st, 2012, 09:27 AM
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Robert Lynch
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S IIa Transmission Swap Questions

I b-in-law has a SIIa 109 were trying to get on the road.

It currently has the stock transmission with an overdrive unit.

If we replace the Tranny with a series III unit,

1) will the T-case fit?
2) will the overdrive unit mate up?

I know we need the bell housing from a 4 cyl SIII to mate it up.

I am assuming the parking brake etc. will be a direct swap as well.

Thanks
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  #2  
Old March 21st, 2012, 11:16 AM
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thanks - do you have a picture of the oil bath throw out parts? or a diagram
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Old March 21st, 2012, 08:36 PM
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no its not out let - maybe this weekend.
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  #4  
Old March 24th, 2012, 08:26 AM
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this came up recently on the RN board. The IIa bellhousing and throwout assembly will fit the SIII box for a "best of both worlds" combination. You get the driveability of the SIII full synchro box and the durability of the oil-lubed throwout bearing of the IIa setup. I believe that this will only work with the IIa trans that has a larger front layshaft bearing. Though, I could be wrong about that. You could also just put in the SIII box but then you are stuck with the plastic throwout bearing, unless you get one of the all-metal ones that are currently available.
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Old March 24th, 2012, 01:22 PM
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that was my B-in-law whom owns the truck, it is here at my house for the work actually.

looks like we have a SIII tranny and bellhouse + tcase, etc.
plan is to use the SIIa bell house if possible - need to figure out if it has the larger front layshaft bearing. or use the SIII bellhouse.
Transfer over the overdrive and install.
that gets us on the road.
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  #6  
Old March 25th, 2012, 11:23 AM
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you can tell which layshaft bearing it has by looking at the housing for the throwout bearing. if it has a bulge on one side then it has the larger bearing.

According to this I think I it is Suffix B, though it could be suffix D too.

http://www.lrfaq.org/Series/FAQ.S.Ch...uffix.IIA.html
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  #7  
Old March 25th, 2012, 11:29 AM
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ok should be a large one in that case - the model year is 1969 - looks like the B suffix was introduced in 1963
In that case a switch of the bellhousing to the SIII transmission would work.
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  #8  
Old April 8th, 2012, 08:48 PM
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got the SIII box in complete with t-case and mated the fairy up to it. with the SIII bell house. works like a champ.
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