7. This photo shows exactly...
7. This photo shows exactly where the crossmember was cut (dashed yellow lines) to allow the driveshaft to work with the new lower-differential mounting location.
8. Next, it was time to install...
8. Next, it was time to install the new crossmember/differential mounting system. We looked at this part with a very critical eye until we were satisfied that it was strong enough to hold up to the abuse of our readers. Pro Comp did a great job of tying in the structural member so that forces from the lower A-arm pivot points would not affect the front drive system. The bracket itself is made from 3/8-inch-thick ductile steel sheet and features gussets and boxing to provide ample strength.
9. Here you can see the new...
9. Here you can see the new differential drop-down assembly as it looked just after the lower A-arms were bolted on. Notice how the new structure includes a relocated lower bumpstop mount for the lower A-arms.
10. In this photo, you can...
10. In this photo, you can see the back side of the differential drop-down assembly. Two stout aft braces are present to negate the added stress of the increased leverage caused by larger tires. Also note the way the new assembly ties into what's left of the existing under-engine crossmember. We think this arrangement is actually stronger than the factory setup.
11. The rear of both Stage...
11. The rear of both Stage 1 and Stage 2 kits includes a pair of 2-inch billet drop blocks to effectively raise the rear of the truck 2 inches over stock.
12. The Pro Comp Stage 1 Tundra...
12. The Pro Comp Stage 1 Tundra kit provides customers with a pair of ES 9000 performance value shocks, which are a fine upgrade, but if tuneability and performance are your goals, go with the Stage 2 kit for the adjustable Pro Comp MX-6 shocks.
13. Pro Comp includes a spacer...
13. Pro Comp includes a spacer kit to lower the center driveshaft bearing. This helps prevent driveline vibration and prolongs U-joint life.
Tactics in Traction Pro Comp...
Tactics in Traction
Pro Comp offers a rear-axle traction-bar setup that virtually eliminates axlewrap and driveline shudder off the line. This is especially effective when towing heavy loads with larger-than-stock tires. We had DC Customs add this to our donor Tundra after the owner had a chance to pull his 24-foot boat without them a couple of times. After seeing the difference it makes, the owner believes there is no other way to go.
Optional Armor Another cool...
Optional Armor
Another cool option for the Tundra 6-inch suspension system is the brushed stainless steel skidplate package. The 14-gauge stainless steel sheet material is laser-cut and CNC-formed to fit perfectly with the factory front bumper. A second piece spans the area directly under the front differential and features flared holes for added rigidity.
Which Kit Should You Buy?
When it comes to performance, the Stage 2 kit is the hands-down winner. However, that gain in function comes with a larger price tag. We think the added ride comfort afforded by the Pro Comp coilover shocks makes it worth the extra money, but if you like the factory ride and simply want to fit a 35-inch tire (or you fear taking your new Tundra off the beaten path), you may want to stick with the Stage 1 spacer version. Here you can see the difference between the two front coilover arrangements.
The Stage 2 kit simplifies installation a little bit because you don't have to deal with removing the factory coil springs from the OE strut assemblies, though the increased bulk of the aluminum-bodied coilovers require additional trimming in some areas of the lower A-arm assemblies. So we think the difference in install effort is negated when everything is said and done. The best part of the Pro Comp Tundra system is the fact that you can always go with the Stage 1 kit right off the bat and then upgrade to the Stage 2 kit as desired.