Time to measure for the custom propshaft.
Silver Sport Transmissions usually supply the prop as part of the Tremec deal, but since this involves actually doing the installation and *then* sending them the measurement for manufacture, I decided to get one made in the UK.
So with the engine and transmission in , I put a load of ballast weight in the boot and raised the axle up to near ride height.
- IMG_3246.jpg (79.62 KiB) Viewed 2024 times
Normal technique for measuring a prop length is to push the transmission slip yoke in all the way, then pull out around 3/4 to 1"
However the shifter extension on the Tremec actually fouls the slip yoke ears if the yoke is pushed fully in. Only after the yoke is already out about 1" do you begin to get clearance.
Phoned SST and they confirmed this , and said to pull the yoke out a further amount after initial clearance is achieved. I did this and ended up with (IIRC) just over 2" of slip yoke exposed. Considered this for a bit and decided to go with it as:
1) Not much alternative
2) No significant radial play between yoke and transmission = not much scope for vibration
3) There still looks to be adequate yoke engaged in the transmission to give strength and stability.
THe yoke takes a 1330 UJ , so I had a prop made with 1330 yokes at both ends, then bought two conversion UJs 1330-7260 and 1330-7290 so that I can fit either size of 8.75 rear.
Whilst the rear axle was up in position I measured the pinion angle , and was pleasantly surprised that the rear axle was 1 degree down relative to the trans. After fitting a non-standard transmission and mount, and non-standard rear springs, at least this is somewhere near the ballpark. I've got some 2 degree wedges I can use to adjust the angle if required after road testing.
I think Matt’s will take the biscuit though,wish I had your skills 
