Bolt Hole Dimensions of Timbren Suspension Enhancement T46GR

Updated 12/15/2025 | Published 11/14/2024

Question:

2023 Grand Design Momentum 399 TH. What are the tie plate dimensions? Will it accommodate 9/16” U-bolts and 1 3/4” wide lead springs? What are tie plate hole center to center dimensions?

asked by: Charles M

Expert Reply:

Hey Charles, the distance between the bolt holes on center on the Timbren kit part # T46GR is 3-1/4 inch by 3 inch. The plate thickness is 3/8 of an inch. This will work with 1-3/4 inch wide leaf springs.

expert reply by: Jameson C

Bolt Hole Dimensions
(click to enlarge)

Jameson C.

12/15/2025

Hey Charles, did the Timbren kit end up fitting your 1-3/4 inch wide leaf springs the way you needed? Knowing how the tie plate dimensions worked out could help others setting up a similar trailer.