I copied my reply to this post on the STF here.
http://www.shoptalkforums.com/viewtopic.php?t=54973
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Originally posted by GS guy I gather they are pretty much the same as T1 in dimensions? Are the later aluminum arm bearings bigger/heavier duty? What's the difference between the early steel arm stub axles/bearings and later aluminum arm stub axles and bearings? Are they interchangable? Are the stub axles interchangable, but with maybe different bearing OD sizing from early to late?
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The arms are the same dimensions but the 944 does have some design differences, internal reinforcement, although they will interchange. Yes the later aluminum arm bearings and stub axles are bigger. The difference is that they are very much heavier duty but I do not have the exact sizes for you. No the bearings nor the stub axle are interchangeable, between the early and late.
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Originally posted by GS guy From reading here and elsewhere, it's my understanding that the early 944 stub axles can be directly swapped with T1 (into the T1 diagonal arm and bearings), with the exceptinon of requiring a different CV joint. Or, the whole arm, axle/bearings and all, can be swapped into a IRS rear car. But I'm interested in the bearing dimensions themselves - are the early 944 bearings the same as T1 inside and outside diameter, or maybe larger outside diameter to fit the 944 arms?
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The 944 complete trailing arm can be put into the Bug or the 944 stub axle, which is the same as the Type 181 "Thing", can be put into the Bug's trailing arm. Yes, the 944 and Bug bearings are the exact dimensions... in fact they are the same part numbers. The conclusion is that the early steel 944 rear trailing arm is actually just a Bug arm with internal reinforcement, 181 Thing stub axles, and Bug wheel bearings.... even the 944 rear disc emergency brake shoes are Bug drum brake shoes. The 944 is mostly all 113 (Super Beetle) and 171 (Rabbit/Golf I) parts.