Nervous, Worried, Help Please!

[nfpgasmask]

OK, so i've had my VX since this past Saturady. 2001 EB with 25,000 miles. Everything is kosher.

Today I drove to work (13 miles, non highway), no issues. Around noon I went out on lunch. I drove to the post office (3 miles away), no issues. When I left the post office, I noticed that the trans was making a hard shift out of first gear. At about 20mph, the truck made a disturbing "clunk", the rpms dropped quick and then everything seemed fine. I went another mile and stopped at a pizza joint for lunch. After lunch, I checked to see if I was leaking anything, negative. So I started her up and drove back to work, with no clunking anymore. I don't get it.

So, could this be a sign of something really bad? Or is this most likely a case of dirty trans fluid? I am going to get this looked at as soon as I can.

Any help from the expert on here would be much appreciated.

Bart

[etlsport]

you should monitor your TOD display around the times when you feel the differences, it took me a little time to get used to the 4wd adjusting itself, i think there was also a post on here recently about someone having a clunking sound from the rear, maybe youre getting that and its not the trans at all? just do a search for the word 'clunk'

[nfpgasmask]

Cool, thanks. I found the one you are talking about I think. So far, this has been sporatic, so maybe it is the "mode selector" switch?????

Bart

[Joe_Black]

LOL! Welcome to Isuzu ownership! That heavy-truck driveline is known to make a lot of "clunking" noises as the torque converter and u-joints load up and unload. Don't worry, either you'll get used to it or never drive an Isuzu truck again.

[nfpgasmask]

LOL! Welcome to Isuzu ownership! That heavy-truck driveline is known to make a lot of "clunking" noises as the torque converter and u-joints load up and unload. Don't worry, either you'll get used to it or never drive an Isuzu truck again.

Well, I don't think this was normal "clunking". Especially since it stopped after I parked for 30 minutes. From everything I have read on here, it seems like it is this infamous "mode selector".

Is this part easy to swap out? It sounds like I can get it from Merlin in MO pretty easily, but my next question is if I should attempt to do this myself, or if I should take it in. I am on the hunt for a qualified, good, honest Isuzu mechanic in the Chicagoland area.

Bart

[AlaskaVX]

Now since it only has 25,000 miles on it I doubt this is it but if the previous owner installed Tone's interceptor (intercepts transmission electronics) they could have the line pressure set high and that would cause a pretty good clunk, but mainly during downshifts.

However I get a lot of clunks with mine as well, and it could possibly be normal...... maybe make sure your drivelines are solid as well, grease the zerks. Keep your eye on the dash lights to see if the light jumps around from "2nd" to "D" to "3rd" etc. this seems to be the real tell tale sign that your mode selector is out of whack.