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Description
Vintage - Metal Unpainted Synchronizer Assembly - J0640391Overview: Synchronizer Assembly Direct Replacement Crown supports its entire line with a 12 month warranty Application: Year Make Model Submodel Engine Size 1945 Jeep Willys 1959 1966 Jeep CJ3 1957 1964 Jeep FC150 1957 1964 Jeep FC170 1966 1971 Jeep Commando 1951 1952 Willys 4 73 Sedan Delivery 1965 1971 Jeep J 100 1953 1955 Willys 4 75 Sedan Delivery 1965 1971 Jeep J 2500 1965 Jeep J 200 1965 Jeep J 210 1959 1983 Jeep CJ5 1959 1975 Jeep CJ6 1949 1958
Overview:
Synchronizer Assembly- Direct Replacement
- Crown supports its entire line with a 12-month warranty
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| 1945 | Jeep | Willys | ||
| 1959 - 1966 | Jeep | CJ3 | ||
| 1957 - 1964 | Jeep | FC150 | ||
| 1957 - 1964 | Jeep | FC170 | ||
| 1966 - 1971 | Jeep | Commando | ||
| 1951 - 1952 | Willys | 4-73 Sedan Delivery | ||
| 1965 - 1971 | Jeep | J-100 | ||
| 1953 - 1955 | Willys | 4-75 Sedan Delivery | ||
| 1965 - 1971 | Jeep | J-2500 | ||
| 1965 | Jeep | J-200 | ||
| 1965 | Jeep | J-210 | ||
| 1959 - 1983 | Jeep | CJ5 | ||
| 1959 - 1975 | Jeep | CJ6 | ||
| 1949 - 1958 | Jeep | Willys | CJ-3 | |
| 1965 - 1969 | Jeep | Gladiator | ||
| 1946 - 1949 | Jeep | Willys | CJ-2 | |
| 1955 - 1958 | Jeep | Willys | CJ-5 | |
| 1965 - 1971 | Jeep | Wagoneer | ||
| 1965 - 1970 | Jeep | J-3600 | ||
| 1965 - 1970 | Jeep | J-3700 | ||
| 1965 - 1971 | Jeep | J-3800 | ||
| 1970 - 1971 | Jeep | J-4500 | ||
| 1970 - 1971 | Jeep | J-4600 | ||
| 1970 - 1971 | Jeep | J-4700 | ||
| 1970 - 1971 | Jeep | J-4800 | ||
| 1965 | Jeep | J-220 | ||
| 1965 | Jeep | J-230 | ||
| 1965 - 1971 | Jeep | J-2600 | ||
| 1965 - 1970 | Jeep | J-2700 | ||
| 1965 | Jeep | J-300 | ||
| 1965 | Jeep | J-310 | ||
| 1965 | Jeep | J-320 | ||
| 1965 | Jeep | J-330 | ||
| 1965 - 1970 | Jeep | J-3500 | ||
| 1956 - 1958 | Jeep | Willys | CJ-6 |
Specs:
Additional Information:
| SKU Number : | J0640391 |
|---|---|
| Brand : | Crown Vintage |
| UPC : | 848399052091 |
| Part Type : | Synchronizer Assembly |
| Dimension : | 2.00(L) X 4.00(W) X 5.00(H) |
| Weight : | 1.90 lbs. |
| Color : | Unpainted |
| Material/Finish : | Metal |
| Sold AS : | Each |
|---|---|
| Quantity Required : | 1 |
| Warranty : | 12 Month |
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4.7 ★★★★★
Based on 28 reviews
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Product Reviews
★★★★★ 5
Great small rolling desk chair.
Color: Black
Small footprint for small office. Comfortable. Nice back support and super easy to assemble. Told my 300lb son he’s not to sit on it. It’s my chair.
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Reviewed in the United States on April 7, 2026
★★★★★ 3
Good as a task chair, but terrible for long-term sitting
I have revised and updated this review after two years after getting a replacement chair, downgrading it from 5 stars to 3 stars.
I have owned an office chair from Staples for two years. It was a $200 office mesh chair. It seemed pretty comfortable when sitting in it at the store. Unfortunately, it turned out to be uncomfortable for long sitting duration, I seemed to end up slouching often because it wasn't very supportive. The seat depth was probably longer than optimal for my legs. The mesh seating was not supportive. With these issues, I thought a task chair would be more useful.
But I didn't want to spend so much money on a chair again, so here comes Amazon to the rescue. This chair allows me to sit comfortably with a reasonable seat depth, so I'm now able to sit with proper posture. The foam base initially felt better than the mesh base. This all led to a 5 star rating. After a year and a half, however, it has come to my realization that the foam seating is terribly inadequate for long periods of sitting. Maybe after a year the foam was worn out to the point that it was no longer supportive. After long periods of sitting, I could feel the wood support base. I tried a seat cushion to no avail.
In the end, I got rid of this chair and purchase a chair from one of the high-end office ergonomic chair manufacturers. It cost 10x more than the Amazon chair, but it's night and day with regards to being comfortable. It is worth the cost to protect my back.
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Reviewed in the United States on August 21, 2019
★★★★★ 5
Very nice office chair
Color: Black
This is a very nice chair at a great price. The cushion and mesh back are really comfortable. It has great height adjustment and range. Assembly was easy. Exactly what I was looking for to use in my home office.
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Reviewed in the United States on March 21, 2026
★★★★★ 5
Love the design, comfort and ease
Color: Grey, Color: Grey
Assembly was a breeze with the Amazon Basics Ergonomic Executive Office Desk Chair. The instructions were clear and easy to follow, and I had the chair put together quickly without any hassle. This simple setup made the whole experience even more satisfying from the start.
In terms of comfort, the chair truly delivers. It provides excellent lumbar support, I assume it will make long hours at my desk much more enjoyable. The adjustable height feature lets me customize my seating position, and the flip-up armrests allow me to slide the chair neatly under my desk without worrying about damage.
Overall, I couldn’t be happier with my purchase. The chair looks stunning in my office and perfectly complements the decor. It combines style, comfort, and practicality at a fantastic value, and I highly recommend it to anyone looking to upgrade their office chair. I love you so much that I ordered another one for my husband’s desk.
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Reviewed in the United States on November 24, 2025
★★★★★ 5
Very comfortable
Color: Grey
I’m not sure if I am just transitioning from a very uncomfortable office chair, but this one is extremely comfortable. Very good dynamic lumbar support that reminds you that it’s there. Only cons would be a low back (I am 6’5”) but I’m not laying my head back anyways. Also the seat length is a touch short for me but standard size really. Great bang for buck with an open box deal. Easy to assemble. TBD on durability.
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Reviewed in the United States on June 10, 2026