[Echofive]

I have a 66 el camino and i have 4 way drum brakes
so i downshift sometimes while coming to a stop.
when downshifting to 1st gear my left rear wheel "skids"
the tires are not bald. I am not sure of gear ratio but i do not have posi. Does anyone know why it would "lock up" it doesnt do it long, about 2 or 3 seconds




Thanx

[DoubleVision]

that`s pretty common when downshifting to lower gear with decent speed, by pulling it to a lower gear, the gears in the transmission aren`t moving, so it causes the sudden "skid" as you discribe since it takes a few seconds for them to be at full momentem of the vehicles speed.

[Shortstep]

Try giving it a lil shot of accelerator before you let out on the clutch. That's become my standard practice when shifting down. It gets the R's up on the engine to match your groundspeed.

[M&M CUSTOM]

It's the exact opposite as dumping the clutch as you upshift and "chirp" the tires while accelerating.
When you downshift and catch the lower gear while the engine is revving lower than in the previous gear, something in the driveline is going to have to "give" in order for the rest of the parts to turn in proportion to each other, and the best part to have give would be the tires.
If the tires didn't give the next part to slip would most likely be the clutch or something else could possibly grenade on you.
You are being just a little too harsh on your downshifts.
The best advise I can give you on this subject is to try to go a little more into your brakes and downshift a little later as your speed decreases to the point it will match your engine speed a little more.

[Echofive]

Thanx for the explanation M&M!

ill be more careful