Jump to content
randyp

2 stick 6 speed and stupid randyp

Recommended Posts

I'm old enough to know more, but I have forgetful mind in my old age. I bought a real clean 80 r-model dump truck couple years ago, 2 stick 6 speed. A Mack mechanic at dealership told me to never ever do any thing other than when leaving pit, use first gear, low range, shift to high range on highway and just drive it like 5 speed. Well, bout the last month I been shifting 1,2,3 low, then go to high side after winding 3 low out, gear ratios are spaced closer like that, faster recovery time, less jet black smoke, and nary a scratch of any kind at all. I even downshift high to low sometimes on certain road conditions, no scratches at all. My question my friends, am I messing up? Doesn't seem to bother trans at all, and truck stays in a cleaner powerband. I think that dealership mechanic was full of doodoo,,what y'all think? randyp

Share this post


Link to post
Share on other sites

Empty I just drive 5 speed high, does great! randyp

Share this post


Link to post
Share on other sites

I'm told over time it will cause damage because the low side gears are not made to spin that fast and will cause damage.On that note I have a 6 speed here I'll sell you if I'm right

  • Like 1

Share this post


Link to post
Share on other sites

HMMMMMMMMMMMMMM drive it like its meant to or given time you will get a big bill but what do I know ??????

Paul

Share this post


Link to post
Share on other sites

I've been driving my 2 stick 6 speed like you for the last 17 years. I'm sure its wrong (like every thing else i do ) But it seems to work better for what I do.

  • Like 1

Share this post


Link to post
Share on other sites

Dernit, powerband just seems so much easier on engine that way,,,i think I'm gonna keep breaking Macks rules,, thanks my friends,,randyp

  • Like 1

Share this post


Link to post
Share on other sites

i ran a 79 DM800 with 237 and a mud stick for 15 years and close to 750,000 miles shifting 123 in low, then 2345 in high when loaded. never broke anything, and still had the original clutch in it when the new truck came in in 95.

the dm also had the dynatard engine brake hooked up to a 2 speed rear switch on the main stick so i could pop it on/off between shifts to keep the rpms up.

Edited by tjc transport

Share this post


Link to post
Share on other sites

Hi Randy, we worked a 6 speed for 18 years on heavy local work. We did over 600,000 miles (but huge hours) and in that time wore out 2 Maxidyne Motors and is now on its third Motor. We always did the123 then into high, as it was easier to get a smooth change at low speed that way. The truck is still going and still has all its original bearings except the rear output one. It is hard to make the first change from Low to High smoothly without grating, at very low speeds unless you are going down hill on a hard road, so I think that the smoother change far outweighs any other possibilities.-Just my thoughts - Kav.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...