Ok, Not too long ago I picked up an 89 GMC Suburban 1500 for the price of $650. This thing was in IMMACULATE shape so I could not pass it up. I bought it only to use as a tow rig since we just found out that the mustang + the weight of the trailer outweighed the old tow rig (My dads 85 Ford F150 4x4) by almost 1500 pounds. Anyways, Off topic, I have been a small car guy all my life. So when it comes to these trucks I'm not too knowledgeable. Of course I do have alot of automotive knowledge so I know the basics. I know it has a 350 TBI with Auto overdrive (Which one? I don't know). Ohh yeah, I should probably mention it is only 2 wheel drive. No snow here in So Cal, no off roading for me so 4x4 is not necessary. However I had a 73 C20 (also 2wd) that I popped the trans on towing. That is why I bought the 89 (the whole burb was cheaper than the trans, why not.....) But I didn't want to chance my life, my dads and moms life, or anyone elses on the road, so I took the larger brakes (and whole suspension of course) and transplanted it under the 89. With the Hummer H2's under there, it is a good looking little rig. But here's what I am looking for as far as schooling: First of all, What trans do I have? It is the stock trans from the 89, that was not changed. TH400, 700R4, 4L60, 4L80, 4L80E?? I don't know how to find out. Second, I do know the 73 had (now the 89 has) a 14 bolt FF rearend. That thing is beefy, but I took it in for a Diff fluid drain and refill and they told me it has alot of sludge. They said I should make my drive this weekend with no problem, but after my trip I should bring it in for a full cleaning. True, Untrue, Something to worry about? Also, What gears do I have? And finally, Is it a Limited Slip or open? Third, Are there any performance enhancers I should consider (please keep in mind that I live in Ca so I must get the truck smogged every 2 years and don't really want to have to remove headers then reinstall them) that won't break the bank? I am talking MAYBE having a budget of $200 per month to upgrade this (or my Vw) and I am bad about saving. So please don't say "Ohh you should save for 6 months and buy xxxxxxxxxx" It won't happen. I am not looking for enough power to pull the mustang on the trailer through glamis dunes or anything, but just something to make it less sluggish on acceleration). Sound would be good too. And hopefully it won't hurt the mileage too much. So with all that in mind, Tell me what you can, tell me what you want, kick me out of the family (please, not really). Thanks alot.