Trailing arm inside diameter
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Parts List:
Rod end supply COM14N (4) $11.67 ea. and COM12N (2) $8.91 ea. These are self lubricating and self sealing monoball units. Rod End Supply claims the trophy truck guys run these in dirt with no problems without boots or additional seals.
QA1 high misalignment spacers SN14-109 (8) $8.99 ea. and SN12-108 (4) $6.99 ea.
The COM14N's and SN14-109's are used at the knuckle end of the trailing arms. The COM12N's and SN12-108's are used at the outer ends of the camber arms.
I counter bored each arm to a depth that centered the monoball in the arm and a diameter that gave a .001-.0015 interference fit. The arms are very soft and must be fixtured carefully to avoid distorting them with clamping forces. Give the surface finishes of both parts I calculate nearly 1000 lbs. force required axially to displace the monoballs so no other means of retention except the press fit.
The QA1 website has all the dimensions for the spacers by P/N, for some reason they are not showing the SN12-108 but Speedway still shows it in their catalog.
Once the machining is done it all just bolts up.
Rod end supply COM14N (4) $11.67 ea. and COM12N (2) $8.91 ea. These are self lubricating and self sealing monoball units. Rod End Supply claims the trophy truck guys run these in dirt with no problems without boots or additional seals.
QA1 high misalignment spacers SN14-109 (8) $8.99 ea. and SN12-108 (4) $6.99 ea.
The COM14N's and SN14-109's are used at the knuckle end of the trailing arms. The COM12N's and SN12-108's are used at the outer ends of the camber arms.
I counter bored each arm to a depth that centered the monoball in the arm and a diameter that gave a .001-.0015 interference fit. The arms are very soft and must be fixtured carefully to avoid distorting them with clamping forces. Give the surface finishes of both parts I calculate nearly 1000 lbs. force required axially to displace the monoballs so no other means of retention except the press fit.
The QA1 website has all the dimensions for the spacers by P/N, for some reason they are not showing the SN12-108 but Speedway still shows it in their catalog.
Once the machining is done it all just bolts up.
And what about the inner camber rod joints? What did you do there?
-Tom
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
https://www.jegs.com/i/QA1/122/SN12-108/10002/-1
https://www.jegs.com/i/QA1/122/SN14-109/10002/-1
https://rodendsupply.com/parts/uniba...ical-bearings/
What did you use to counter bore the rods?
https://www.jegs.com/i/QA1/122/SN14-109/10002/-1
https://rodendsupply.com/parts/uniba...ical-bearings/
What did you use to counter bore the rods?
