Reply to Thread

Message

<blockquote data-quote="4play" data-source="post: 4247293" data-attributes="member: 7223">You have an option to change 1st gear, if you wanted but it won&#039;t change the upper gears as in for cruising speeds.&nbsp; This trans is a ZF S5-42 (wide ratio, 5.72 )The same transmission model number, but called (close ratio 4.65) was used in the diesels and can be swapped.&nbsp; People have been known to swap these transmissions either way depending on their desire.&nbsp; To lower the RPM across all ranges, like mentioned already, swap the rear gears. I believe the two gear options offered new were 3.55 &amp; 4.10, I assume you have the 4.10.&nbsp; If&nbsp; 4.10 ratio, I would drop to 3.73 if doing heavy wotk, or drop to 3.55&nbsp; otherwise. Here&#039;s,&nbsp; the approx RPM for 70mph with 3 diff ratios.&nbsp;&nbsp; I assumed the tires are about 31&quot; tall. @70mph&nbsp; 4.11 = 2414 rpm3.73 = 2191 rpm3.55 = 2085 rpm</blockquote>

[QUOTE="4play, post: 4247293, member: 7223"] You have an option to change 1st gear, if you wanted but it won't change the upper gears as in for cruising speeds. This trans is a ZF S5-42 (wide ratio, 5.72 )The same transmission model number, but called (close ratio 4.65) was used in the diesels and can be swapped. People have been known to swap these transmissions either way depending on their desire. To lower the RPM across all ranges, like mentioned already, swap the rear gears. I believe the two gear options offered new were 3.55 & 4.10, I assume you have the 4.10. If 4.10 ratio, I would drop to 3.73 if doing heavy wotk, or drop to 3.55 otherwise. Here's, the approx RPM for 70mph with 3 diff ratios. I assumed the tires are about 31" tall. @70mph 4.11 = 2414 rpm 3.73 = 2191 rpm 3.55 = 2085 rpm [/QUOTE]

Verification