5.0 out of 5 stars Smoother shifts almost immediately

T. · May 9, 2025

(function() { P.when('cr-A', 'ready').execute(function(A) { if(typeof A.toggleExpanderAriaLabel === 'function') { A.toggleExpanderAriaLabel('review_text_read_more', 'Read more of this review', 'Read less of this review'); } }); })(); .review-text-read-more-expander:focus-visible { outline: 2px solid #2162a1; outline-offset: 2px; border-radius: 5px; } This product works. I have a 4L80E Transmission that's practically new, and it ran only on Dexron 6 and nothing else. The shifts were okay, but a few times, the 1st to 2nd gear upshifts were noticeable -- not harsh or anything, but it felt firmer than I like it to be. I removed 10 fluid oz of ATF and added 10 fluid oz of this Lubegard additive. After driving about 10 to 15 miles, the results were already noticeable. The transmission shifts much smoother, especially the 1st to 2nd gear upshifts. Overall, I'm happy with this additive.

5.0 out of 5 stars Great shifting corrector.

R.C. · June 7, 2025

I've used lubegard many times over the past 20 yrs and it really works. It's a great protective additive for most auto transmissions. I've even seen it correct shifting issues. Use it, it will surprise you.

5.0 out of 5 stars Fixed my transmission stutter

J. · January 24, 2025

I have used this in a 2015 Suburban with 195k miles - a fluid change with filter and this Lube Gard has the transmission working much better and no more studder. It will extend the life before I need to rebuild the transmission.Also tried it on my Honda Odyssey - with erratic shifting. Did fluid change and Lube Gard and it’s now shifting crisp again. 198k miles.Very pleased.

5.0 out of 5 stars Cured hard shifting in 4T65E👍

S. · October 21, 2024

My 2002 gm vehicle with 3400 v6 and 4T65E trans had around 225k miles on and in warm weather the trans started shifting super firm, this was due to a design flaw and wear. What happens is the computer sees some shifts are too slow, which causes it to trip into max-adapt mode which dramatically increases line pressure. Generally this can be corrected by installing a transgo shift kit or similar. However my fluid was changed only 15k miles before, and I decided try lubegard red first and had good success, haven’t detected any hard shifts since.

4.0 out of 5 stars Cheap insurance for your transmission

J.W. · June 12, 2014

Lubegard Red is one of very few ATF additives to get OEM recommendations, so I trust it to, at worst, do no harm, and potentially help keep my transmission shifting well. I wouldn't expect miracles, but other than dirty fluid, my trans had no symptoms of wear or age. After draining and replacing about half the fluid (the rest is held in the torque converter, and will be changed out slowly over a few more drain and fills), and adding 1 ounce of Lubegard per quart of fluid, I think the shifts are a little smoother, and possibly a little faster under acceleration, but it's hard to say. That makes me happy, as it implies nothing was amiss before the drain and fill.

5.0 out of 5 stars Love this stuff

M.m. · December 12, 2024

Love it works

5.0 out of 5 stars Fixed 08 Impala!

P. · May 30, 2023

2008 Impalas trans (4T65E) was intermittently holding second gear from a stop for a moment then would drop back down to 1st gear. Was harsh if stepping on throttle a fair amount. I changed fluid and filter and added 14 ounces of Lube Guard. Had same issue on first move down road after adding, obviously took time to do its magic and hasn't done it once since in 1500 miles! Truly worked. Worth a try. This transmission wasn't in bad shape, wasn't slipping, fluid wasn't burnt, pan had normal debris on magnet and 120000 miles.Update: 04/12/25 Changed fluid and filter at 150000 miles last Summer and added 7 more ounces of Lubeguard. Perfect! Worth every penny!

5.0 out of 5 stars Best stuff ever

a.m. · November 21, 2024

Takes away shudder instantly