I recently had a.post regarding my tranny not going into 5th gear, but is there anyway I can tell what kind of transmission I have by just looking under the truck.

 

if its a l43 you dont have a 5th gear.

 

http://www.4x4wire.com/toyota/faq/parts/ this might help you not sure
The tag on the firevwall should say what it came with from the factory but i dont remember how to read it off the top of my head

 

L43 is a side shifter..
Externally a 4 speed L45,will look like a L50/52 5 speed

 

you can go to marlin crawlers site and look at the trans pics...very helpfull!!!

 

I have had my truck for a week now and there is a new issue now I'm trying to understand when I get to around 60mph it's making a loud roaring noise and a vibration and its not the tires . I can't tell if its coming from the engine or what but it is very stressful, the transmission want go into 5th and it makes a knocking noise when I let the clutch out, can this be the transmission making the horrible noise or what

 

My dads g52 did somthin simalar to what your discribing when his input or output bearing went out(i dont remember which went out) it would go into all the gears though