synthetic's in trans and rears ?
#1
Registered
Thread Starter
synthetic's in trans and rears ?
1999 F-250 used 50/50 pleasure, towing. anybody using synthetics in there transmissions and rears? if so whos and changing at what intervals...
#2
Registered
Join Date: Oct 2004
Location: medellin colombia, pablo escobar's lil town
Posts: 8,390
Likes: 0
Received 6 Likes
on
4 Posts
Re: synthetic's in trans and rears ?
Originally Posted by berns29scarab
1999 F-250 used 50/50 pleasure, towing. anybody using synthetics in there transmissions and rears? if so whos and changing at what intervals...
#3
Registered User
Re: synthetic's in trans and rears ?
I use synthetic in everything- including the premix for my weedwhacker. Try to stick close to the mfg. recommended intervals or at least no more than 50% over. I know they'll go longer- I use them as "I forgot" insurance rather than money savers.
I have one GM 5.7 with 425K on it- never been opened up. Put injectors in it (again) this summer. Did the compression- 185 psi +/- 5. Not bad.
I have one GM 5.7 with 425K on it- never been opened up. Put injectors in it (again) this summer. Did the compression- 185 psi +/- 5. Not bad.
#5
Re: synthetic's in trans and rears ?
I use synthetics on all my stuff as well....oil changes on the engine i do every 10k miles....the filters i change every 3k and top off with frsh oil.....the trans on my last truck was changed at 45k and i got rid of it at 134k and the oil was like the day i put it in....and thats with 3 trips down to Tampa pulling a 30' boat.....my current truck i bought at 150k miles.....changes to all synthetic the first weekend.....it now has 170k and runs like new still....It all comes down to maintenece....change your oils like the mnf suggests and regular oils will be just fine......i'm lazy and prefer just doing a 30sec oil filter change every so often
__________________
-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
#6
Registered
Join Date: May 2004
Location: Stuck In a Cuban Prison Camp
Posts: 2,146
Likes: 0
Received 0 Likes
on
0 Posts
Re: synthetic's in trans and rears ?
I use synthetic in the motor.
What about the trani ? I got my truck with 107K on it, Now it has 127K can I just drain the trani pan and refill with synthetic trani fluid ?
99 F250 S/D 4x4 Diesel
What about the trani ? I got my truck with 107K on it, Now it has 127K can I just drain the trani pan and refill with synthetic trani fluid ?
99 F250 S/D 4x4 Diesel
Last edited by CROWN MAN; 09-14-2006 at 10:33 AM.
#7
Platinum Member
Platinum Member
iTrader: (1)
Re: synthetic's in trans and rears ?
I build transmissions as a business,ANY synthetic atf is a great improvement over oem fluid for most transmissions,don't be afraid to change it out. As far as rear ends if you live where it is extremely hot and tow extreme loads use 75/140 or any version that has second number of 140 (the viscosity index hot) in a full synthetic.If you drive empty the majority of the time or have cold seasons a 75 or 80/90 full synthetic is your best bet as the thicker oil will hurt your mileage and doesn't flow as well when real cold. A few things to keep in mind is the duramaxes 05 and older came with dexron 3 and should be converted to castrol transynd which was specifically designed for them. The dodge and ford trucks with limited slip rear ends should always have a posi addittive added to them when changeing rear end oil to prevent chattering when making wide turns,it about 5 dollars a bottle,the gm's use a gov lock posi so its uneccessary on them,Smitty
#8
Registered
Join Date: Nov 2003
Location: 1 Flu Ovr KuKos Nest-WI
Posts: 9,950
Likes: 0
Received 0 Likes
on
0 Posts
Re: synthetic's in trans and rears ?
I run 75/90 Mobil Synth in both axles.
OEM stuff for the trans, with a Lucas additive.
Standard warranty on Peterbilts is 3yr/300,000 mi...trans and rears
When you run Synth in rear ends you get a 5yr/750,000 mi warranty
Synth in trans goes to 5yr/500,000 mi
OEM stuff for the trans, with a Lucas additive.
Standard warranty on Peterbilts is 3yr/300,000 mi...trans and rears
When you run Synth in rear ends you get a 5yr/750,000 mi warranty
Synth in trans goes to 5yr/500,000 mi
Last edited by Downtown42; 09-14-2006 at 02:53 PM.
#9
Registered User
Re: synthetic's in trans and rears ?
Originally Posted by ratman
that egine doesn't owe you a thing dayum dude thats the most ive ever seen on a sbc
Unfortunately, I can't say the same for the transmission. The truck is on its 5th one. The 4L60 is a POS.
#10
Registered
Join Date: Oct 2004
Location: medellin colombia, pablo escobar's lil town
Posts: 8,390
Likes: 0
Received 6 Likes
on
4 Posts
Re: synthetic's in trans and rears ?
Originally Posted by Chris Sunkin
Unfortunately, I can't say the same for the transmission. The truck is on its 5th one. The 4L60 is a POS.