Weight is also a factor. They weigh an extra 35kg over a Muncie.T56's (non-Magnum) and TR6060's are OEM gearboxes from certain Commodores for example.
It's not that they are "too much work" to fit. They take a bit more work, and have advantages and disadvantages, but I explained my preference above.
Edited by Lima31, 11 January 2022 - 01:20 PM.